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/**
* Back 2 Browser Bytecode Translator
* Copyright (C) 2012-2017 Jaroslav Tulach
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, version 2 of the License.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. Look for COPYING file in the top folder.
* If not, see http://opensource.org/licenses/GPL-2.0.
*/
package org.apidesign.vm4brwsr;
import java.io.IOException;
import org.apidesign.vm4brwsr.ByteCodeParser.TypeArray;
final class StackMapper {
private final TypeArray stackTypeIndexPairs;
private final StringArray stackValues;
private boolean dirty;
public StackMapper() {
stackTypeIndexPairs = new TypeArray();
stackValues = new StringArray();
}
public void clear() {
stackTypeIndexPairs.clear();
stackValues.clear();
dirty = false;
}
public void syncWithFrameStack(final TypeArray frameStack) {
clear();
final int size = frameStack.getSize();
for (int i = 0; i < size; ++i) {
pushTypeImpl(VarType.fromStackMapType(frameStack.get(i)));
}
}
public Variable pushI() {
return pushT(VarType.INTEGER);
}
public Variable pushL() {
return pushT(VarType.LONG);
}
public Variable pushF() {
return pushT(VarType.FLOAT);
}
public Variable pushD() {
return pushT(VarType.DOUBLE);
}
public Variable pushA() {
return pushT(VarType.REFERENCE);
}
public Variable pushT(final int type) {
return getVariable(pushTypeImpl(type));
}
void assign(Appendable out, int varType, CharSequence s) throws IOException {
pushTypeAndValue(varType, s);
}
void replace(Appendable out, int varType, String format, CharSequence... arr)
throws IOException {
StringBuilder sb = new StringBuilder();
ByteCodeToJavaScript.emitImpl(sb, format, arr);
String[] values = stackValues.toArray();
final int last = stackTypeIndexPairs.getSize() - 1;
values[last] = sb.toString();
dirty = true;
final int value = (last << 8) | (varType & 0xff);
stackTypeIndexPairs.set(last, value);
}
void flush(Appendable out) throws IOException {
int count = stackTypeIndexPairs.getSize();
for (int i = 0; i < count; i++) {
String val = stackValues.getAndClear(i, true);
if (val == null) {
continue;
}
CharSequence var = getVariable(stackTypeIndexPairs.get(i));
ByteCodeToJavaScript.emitImpl(out, "var @1 = @2;", var, val);
}
dirty = false;
}
public boolean isDirty() {
return dirty;
}
public CharSequence popI() {
return popT(VarType.INTEGER);
}
public CharSequence popL() {
return popT(VarType.LONG);
}
public CharSequence popF() {
return popT(VarType.FLOAT);
}
public CharSequence popD() {
return popT(VarType.DOUBLE);
}
public CharSequence popA() {
return popT(VarType.REFERENCE);
}
public CharSequence popT(final int type) {
final CharSequence variable = getT(0, type);
popImpl(1);
return variable;
}
public CharSequence popValue() {
final CharSequence variable = getT(0, -1);
popImpl(1);
return variable;
}
public Variable pop(Appendable out) throws IOException {
flush(out);
final Variable variable = get(0);
popImpl(1);
return variable;
}
public void pop(final int count) {
final int stackSize = stackTypeIndexPairs.getSize();
if (count > stackSize) {
throw new IllegalStateException("Stack underflow");
}
popImpl(count);
}
public CharSequence getI(final int indexFromTop) {
return getT(indexFromTop, VarType.INTEGER);
}
public CharSequence getL(final int indexFromTop) {
return getT(indexFromTop, VarType.LONG);
}
public CharSequence getF(final int indexFromTop) {
return getT(indexFromTop, VarType.FLOAT);
}
public CharSequence getD(final int indexFromTop) {
return getT(indexFromTop, VarType.DOUBLE);
}
public CharSequence getA(final int indexFromTop) {
return getT(indexFromTop, VarType.REFERENCE);
}
public CharSequence getT(final int indexFromTop, final int type) {
return getT(indexFromTop, type, true);
}
public CharSequence getT(final int indexFromTop, final int type, boolean clear) {
final int stackSize = stackTypeIndexPairs.getSize();
if (indexFromTop >= stackSize) {
throw new IllegalStateException("Stack underflow");
}
final int stackValue =
stackTypeIndexPairs.get(stackSize - indexFromTop - 1);
if (type != -1 && (stackValue & 0xff) != type) {
throw new IllegalStateException("Type mismatch");
}
String value =
stackValues.getAndClear(stackSize - indexFromTop - 1, clear);
if (value != null) {
return value;
}
return getVariable(stackValue);
}
public Variable get(final int indexFromTop) {
final int stackSize = stackTypeIndexPairs.getSize();
if (indexFromTop >= stackSize) {
throw new IllegalStateException("Stack underflow");
}
final int stackValue =
stackTypeIndexPairs.get(stackSize - indexFromTop - 1);
return getVariable(stackValue);
}
private int pushTypeImpl(final int type) {
final int count = stackTypeIndexPairs.getSize();
final int value = (count << 8) | (type & 0xff);
stackTypeIndexPairs.add(value);
addStackValue(count, null);
return value;
}
private void pushTypeAndValue(final int type, CharSequence v) {
final int count = stackTypeIndexPairs.getSize();
final int value = (count << 8) | (type & 0xff);
stackTypeIndexPairs.add(value);
final String val = v.toString();
addStackValue(count, val);
}
private void addStackValue(int at, final String val) {
final String[] arr = stackValues.toArray();
if (arr.length > at) {
arr[at] = val;
} else {
stackValues.add(val);
}
dirty = true;
}
private void popImpl(final int count) {
final int stackSize = stackTypeIndexPairs.getSize();
stackTypeIndexPairs.setSize(stackSize - count);
}
public Variable getVariable(final int typeAndIndex) {
final int type = typeAndIndex & 0xff;
final int index = typeAndIndex >> 8;
return Variable.getStackVariable(type, index);
}
}
