/*
* $Id$
*
* Copyright (C) 2003-2015 JNode.org
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published
* by the Free Software Foundation; either version 2.1 of the License, or
* (at your option) any later version.
*
* This library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; If not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
package org.jnode.vm.x86.compiler.l1b;
import org.jnode.assembler.Label;
import org.jnode.assembler.x86.X86Assembler;
import org.jnode.assembler.x86.X86Constants;
import org.jnode.assembler.x86.X86Register;
import org.jnode.assembler.x86.X86Register.FPU;
import org.jnode.assembler.x86.X86Register.GPR;
import org.jnode.assembler.x86.X86Register.GPR32;
import org.jnode.assembler.x86.X86Register.GPR64;
import org.jnode.bootlog.BootLogInstance;
import org.jnode.vm.JvmType;
import org.jnode.vm.facade.VmUtils;
/**
* @author Ewout Prangsma (epr@users.sourceforge.net)
*/
final class FPCompilerFPU extends FPCompiler {
/**
* @param os
* @param ec
* @param vstack
*/
public FPCompilerFPU(X86BytecodeVisitor bcv, X86Assembler os,
EmitterContext ec, VirtualStack vstack, int arrayDataOffset) {
super(bcv, os, ec, vstack, arrayDataOffset);
}
/**
* fadd / dadd
*
* @param ec
* @param vstack
* @param type
*/
final void add(int type) {
final ItemFactory ifac = ec.getItemFactory();
final Item v2 = vstack.pop(type);
final Item v1 = vstack.pop(type);
if (v1.isConstant() && v2.isConstant()) {
final double fpv1 = getFPValue(v1);
final double fpv2 = getFPValue(v2);
vstack.push(createConst(ifac, type, fpv1 + fpv2));
v1.release(ec);
v2.release(ec);
} else {
// Prepare stack
final FPUStack fpuStack = vstack.fpuStack;
final FPU reg = prepareForOperation(os, ec, vstack, fpuStack, v2, v1, true);
final Item result = fpuStack.getItem(reg);
fpuStack.pop();
// Calculate
os.writeFADDP(reg);
// Push result
vstack.push(result);
}
}
/**
* fcmpg, fcmpl, dcmpg, dcmpl
*
* @param os
* @param ec
* @param vstack
* @param gt
* @param type
* @param curInstrLabel
*/
final void compare(boolean gt, int type, Label curInstrLabel) {
final Item v2 = vstack.pop(type);
final Item v1 = vstack.pop(type);
// Prepare operands
final FPUStack fpuStack = vstack.fpuStack;
final FPU reg = prepareForOperation(os, ec, vstack, fpuStack, v2, v1, false);
// We need reg to be ST1.
fxchST1(os, fpuStack, reg);
final X86RegisterPool pool = ec.getGPRPool();
pool.request(X86Register.EAX);
final IntItem result = (IntItem) L1AHelper.requestWordRegister(ec,
JvmType.INT, false);
final GPR resr = result.getRegister();
// Clear resultr
os.writeXOR(resr, resr);
if (!gt) {
// Reverse order
FPUHelper.fxch(os, fpuStack, X86Register.ST1);
}
os.writeFUCOMPP(); // Compare, Pop twice
os.writeFNSTSW_AX(); // Store fp status word in AX
if (os.isCode32()) {
os.writeSAHF(); // Store AH to Flags
}
// Pop fpu stack twice (FUCOMPP)
fpuStack.pop();
fpuStack.pop();
final Label gtLabel = new Label(curInstrLabel + "gt");
final Label ltLabel = new Label(curInstrLabel + "lt");
final Label endLabel = new Label(curInstrLabel + "end");
if (os.isCode32()) {
os.writeJCC(gtLabel, X86Constants.JA);
os.writeJCC(ltLabel, X86Constants.JB);
} else {
// Emulate JA
os.writeTEST(X86Register.EAX, (X86Constants.F_CF | X86Constants.F_ZF) << 8);
os.writeJCC(gtLabel, X86Constants.JZ);
// Emulate JB
os.writeTEST(X86Register.EAX, (X86Constants.F_CF) << 8);
os.writeJCC(ltLabel, X86Constants.JNZ);
}
os.writeJMP(endLabel); // equal
// Greater
os.setObjectRef(gtLabel);
if (gt) {
os.writeDEC(resr);
} else {
os.writeINC(resr);
}
os.writeJMP(endLabel);
// Less
os.setObjectRef(ltLabel);
if (gt) {
os.writeINC(resr);
} else {
os.writeDEC(resr);
}
// End
os.setObjectRef(endLabel);
// Push result
vstack.push(result);
// Release
pool.release(X86Register.EAX);
}
/**
* f2x / d2x
*
* @param ec
* @param vstack
*/
final void convert(int fromType, int toType) {
final ItemFactory ifac = ec.getItemFactory();
final Item v = vstack.pop(fromType);
if (v.isConstant()) {
vstack.push(createConst(ifac, toType, getFPValue(v)));
v.release(ec);
} else {
v.pushToFPU(ec);
vstack.fpuStack.pop(v);
v.release(ec);
final Item result = ifac.createFPUStack(toType);
vstack.push(result);
vstack.fpuStack.push(result);
// Now load to GPR (to force conversion)
result.loadToGPR(ec);
}
}
/**
* fdiv / ddiv
*
* @param ec
* @param vstack
* @param type
*/
final void div(int type) {
final ItemFactory ifac = ec.getItemFactory();
final Item v2 = vstack.pop(type);
final Item v1 = vstack.pop(type);
if (v1.isConstant() && v2.isConstant()) {
final double fpv1 = getFPValue(v1);
final double fpv2 = getFPValue(v2);
vstack.push(createConst(ifac, type, fpv1 / fpv2));
v1.release(ec);
v2.release(ec);
} else {
// Prepare stack
final FPUStack fpuStack = vstack.fpuStack;
final FPU reg = prepareForOperation(os, ec, vstack, fpuStack, v2, v1, false);
final Item result = fpuStack.getItem(reg);
fpuStack.pop();
// Calculate
os.writeFDIVP(reg);
// Push result
vstack.push(result);
}
}
/**
* Ensure that there are at least items registers left on the FPU stack. If
* the number of items is not free, the stack is flushed onto the CPU stack.
*
* @param os
* @param ec
* @param vstack
* @param items
*/
static final void ensureStackCapacity(X86Assembler os, EmitterContext ec,
VirtualStack vstack, int items) {
final FPUStack fpuStack = vstack.fpuStack;
if (!fpuStack.hasCapacity(items)) {
BootLogInstance.get().debug("Flush FPU stack;\n fpuStack=" + fpuStack
+ ",\n vstack =" + vstack);
vstack.push(ec);
if (VmUtils.verifyAssertions())
VmUtils._assert(fpuStack.hasCapacity(items), "Out of FPU stack");
}
}
/**
* Swap the given register and ST1 unless the given register is already ST1.
*
* @param os
* @param fpuStack
* @param fpuReg
*/
private static final void fxchST1(X86Assembler os, FPUStack fpuStack,
FPU fpuReg) {
// We need reg to be ST1, if not swap
if (fpuReg != X86Register.ST1) {
// Swap reg with ST0
FPUHelper.fxch(os, fpuStack, fpuReg);
FPUHelper.fxch(os, fpuStack, X86Register.ST1);
FPUHelper.fxch(os, fpuStack, fpuReg);
}
}
/**
* fmul / dmul
*
* @param ec
* @param vstack
* @param type
*/
final void mul(int type) {
final ItemFactory ifac = ec.getItemFactory();
final Item v2 = vstack.pop(type);
final Item v1 = vstack.pop(type);
if (v1.isConstant() && v2.isConstant()) {
final double fpv1 = getFPValue(v1);
final double fpv2 = getFPValue(v2);
vstack.push(createConst(ifac, type, fpv1 * fpv2));
v1.release(ec);
v2.release(ec);
} else {
// Prepare stack
final FPUStack fpuStack = vstack.fpuStack;
final FPU reg = prepareForOperation(os, ec, vstack, fpuStack, v2, v1, true);
final Item result = fpuStack.getItem(reg);
fpuStack.pop();
// Calculate
os.writeFMULP(reg);
// Push result
vstack.push(result);
}
}
/**
* fneg / dneg
*
* @param ec
* @param vstack
* @param type
*/
final void neg(int type) {
final ItemFactory ifac = ec.getItemFactory();
final Item v = vstack.pop(type);
if (v.isConstant()) {
final double fpv = getFPValue(v);
vstack.push(createConst(ifac, type, -fpv));
v.release(ec);
} else {
// Prepare
final FPUStack fpuStack = vstack.fpuStack;
prepareForOperation(os, ec, vstack, fpuStack, v);
// Calculate
os.writeFCHS();
// Push result
vstack.push(v);
}
}
/**
* Make sure that the given operand is on the top on the FPU stack.
*/
private static void prepareForOperation(X86Assembler os,
EmitterContext ec, VirtualStack vstack, FPUStack fpuStack,
Item left) {
final boolean onFpu = left.isFPUStack();
// If the FPU stack will be full in this operation, we flush the vstack
// first.
int extraItems = onFpu ? 0 : 1;
ensureStackCapacity(os, ec, vstack, extraItems);
if (onFpu) {
// Operand is on the FPU stack
if (!fpuStack.isTos(left)) {
// operand not on top, exchange it.
final FPU reg = fpuStack.getRegister(left);
os.writeFXCH(reg);
fpuStack.fxch(reg);
}
} else {
// operand is not on FPU stack
left.pushToFPU(ec); // Now left is on top
}
}
/**
* Make sure both operand are on the FPU stack, on of which is in ST0. The
* FPU register of the other operand is returned. If commutative is true,
* either left of right will be located in ST0, if commutative is false, the
* left operand will be in ST0.
* <p/>
* The item at ST0 is popped of the given fpuStack stack.
*
* @param left
* @param right
*/
private static FPU prepareForOperation(X86Assembler os,
EmitterContext ec, VirtualStack vstack, FPUStack fpuStack,
Item left, Item right, boolean commutative) {
final boolean lOnFpu = left.isFPUStack();
final boolean rOnFpu = right.isFPUStack();
final FPU reg;
// If the FPU stack will be full in this operation, we flush the vstack
// first.
int extraItems = 0;
extraItems += lOnFpu ? 0 : 1;
extraItems += rOnFpu ? 0 : 1;
ensureStackCapacity(os, ec, vstack, extraItems);
if (lOnFpu && rOnFpu) {
// Both operand are on the FPU stack
if (fpuStack.isTos(left)) {
// Left already on top
reg = fpuStack.getRegister(right);
} else if (fpuStack.isTos(right)) {
// Right on top
reg = fpuStack.getRegister(left);
if (commutative) {
// Commutative so return left register
} else {
// Non-commutative, so swap left-right and return left
// register
// System.out.println("stack: " + fpuStack + "\nleft: " +
// left + "\nright: " + right + "\nreg: " + reg);
FPUHelper.fxch(os, fpuStack, reg);
}
} else {
// Neither left not right on top
FPUHelper.fxch(os, fpuStack, fpuStack.getRegister(left)); // Swap left &
// ST0, now left
// is on top
reg = fpuStack.getRegister(right);
}
} else if (!(lOnFpu || rOnFpu)) {
// Neither operands are on the FPU stack
left.pushToFPU(ec);
right.pushToFPU(ec); // Now right is on top
reg = X86Register.ST1; // Left is just below top
if (!commutative) {
FPUHelper.fxch(os, fpuStack, reg);
}
} else if (lOnFpu) {
// Left operand is on FPU stack, right is not
right.pushToFPU(ec); // Now right is on top
// BootLogInstance.get().debug("left.kind=" + left.getKind());
reg = fpuStack.getRegister(left);
if (!commutative) {
FPUHelper.fxch(os, fpuStack, reg);
}
} else {
// Right operand is on FPU stack, left is not
left.pushToFPU(ec); // Now left is on top
reg = fpuStack.getRegister(right);
}
return reg;
}
/**
* frem / drem
*
* @param ec
* @param vstack
* @param type
*/
final void rem(int type) {
final ItemFactory ifac = ec.getItemFactory();
final Item v2 = vstack.pop(type);
final Item v1 = vstack.pop(type);
if (v1.isConstant() && v2.isConstant()) {
final double fpv1 = getFPValue(v1);
final double fpv2 = getFPValue(v2);
vstack.push(createConst(ifac, type, fpv1 % fpv2));
v1.release(ec);
v2.release(ec);
} else {
// Prepare stack
final FPUStack fpuStack = vstack.fpuStack;
final FPU reg = prepareForOperation(os, ec, vstack, fpuStack, v2, v1, false);
// We need reg to be ST1, if not swap
fxchST1(os, fpuStack, reg);
// Pop the fpuStack.tos
fpuStack.pop();
// Calculate
os.writeFXCH(X86Register.ST1);
os.writeFPREM();
os.writeFSTP(X86Register.ST1);
// Push result
vstack.push(fpuStack.tos());
}
}
/**
* fsub / dsub
*
* @param ec
* @param vstack
* @param type
*/
final void sub(int type) {
final ItemFactory ifac = ec.getItemFactory();
final Item v2 = vstack.pop(type);
final Item v1 = vstack.pop(type);
if (v1.isConstant() && v2.isConstant()) {
final double fpv1 = getFPValue(v1);
final double fpv2 = getFPValue(v2);
vstack.push(createConst(ifac, type, fpv1 - fpv2));
v1.release(ec);
v2.release(ec);
} else {
// Prepare stack
final FPUStack fpuStack = vstack.fpuStack;
final FPU reg = prepareForOperation(os, ec, vstack, fpuStack, v2, v1, false);
final Item result = fpuStack.getItem(reg);
fpuStack.pop();
// Calculate
os.writeFSUBP(reg);
// Push result
vstack.push(result);
}
}
/**
* faload / daload
*
* @param type
*/
final void fpaload(int type) {
final IntItem idx = vstack.popInt();
final RefItem ref = vstack.popRef();
idx.loadIf(ec, ~Item.Kind.CONSTANT);
ref.load(ec);
final GPR refr = ref.getRegister();
bcv.checkBounds(ref, idx);
ensureStackCapacity(os, ec, vstack, 1);
if (type == JvmType.FLOAT) {
if (idx.isConstant()) {
final int offset = idx.getValue() * 4;
os.writeFLD32(refr, offset + arrayDataOffset);
} else {
GPR idxr = idx.getRegister();
if (os.isCode64()) {
final GPR64 idxr64 = (GPR64) ec.getGPRPool().getRegisterInSameGroup(idxr, JvmType.LONG);
os.writeMOVSXD(idxr64, (GPR32) idxr);
idxr = idxr64;
}
os.writeFLD32(refr, idxr, 4, arrayDataOffset);
}
} else {
if (idx.isConstant()) {
final int offset = idx.getValue() * 8;
os.writeFLD64(refr, offset + arrayDataOffset);
} else {
GPR idxr = idx.getRegister();
if (os.isCode64()) {
final GPR64 idxr64 = (GPR64) ec.getGPRPool().getRegisterInSameGroup(idxr, JvmType.LONG);
os.writeMOVSXD(idxr64, (GPR32) idxr);
idxr = idxr64;
}
os.writeFLD64(refr, idxr, 8, arrayDataOffset);
}
}
// Release
ref.release(ec);
idx.release(ec);
// Push result
final ItemFactory ifac = ec.getItemFactory();
final Item result = ifac.createFPUStack(type);
vstack.fpuStack.push(result);
vstack.push(result);
}
}