/*
* @(#) $(JCGO)/jtrsrc/com/ivmaisoft/jcgo/TryStatement.java --
* a part of JCGO translator.
**
* Project: JCGO (http://www.ivmaisoft.com/jcgo/)
* Copyright (C) 2001-2012 Ivan Maidanski <ivmai@mail.ru>
* All rights reserved.
*/
/*
* This 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; either version 2, or (at your option)
* any later version.
**
* This software 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 (GPL) for more details.
**
* Linking this library statically or dynamically with other modules is
* making a combined work based on this library. Thus, the terms and
* conditions of the GNU General Public License cover the whole
* combination.
**
* As a special exception, the copyright holders of this library give you
* permission to link this library with independent modules to produce an
* executable, regardless of the license terms of these independent
* modules, and to copy and distribute the resulting executable under
* terms of your choice, provided that you also meet, for each linked
* independent module, the terms and conditions of the license of that
* module. An independent module is a module which is not derived from
* or based on this library. If you modify this library, you may extend
* this exception to your version of the library, but you are not
* obligated to do so. If you do not wish to do so, delete this
* exception statement from your version.
*/
package com.ivmaisoft.jcgo;
import java.util.Enumeration;
/**
* Grammar production for 'try' clause.
**
* Formats: TRY Block FINALLY Block TRY Block Catches Empty Empty TRY Block
* Catches FINALLY Block
*/
class TryStatement extends LexNode {
private TryStatement currentTry;
private ObjHashSet changedVars;
private ObjHashSet accessedOuterObjLocals;
private boolean isThisAccessed;
private ClassDefinition callerClass;
private String catchesSuffix;
TryStatement(Term b, Term d) {
super(b, Empty.newTerm(), d);
}
TryStatement(Term b, Term c, Term e) {
super(b, c, e);
}
void processPass1(Context c) {
if (terms[2].notEmpty() && terms[1].notEmpty()) {
terms[0] = new TryStatement(terms[0], terms[1], Empty.newTerm());
terms[1] = Empty.newTerm();
}
callerClass = c.currentClass;
currentTry = c.currentTry;
assertCond(c.currentMethod != null);
c.currentMethod.setNeedsDummyRet();
c.currentTry = this;
if (terms[1].notEmpty() || terms[2].notEmpty()) {
int oldForceVmExc = c.forceVmExc;
if (terms[1].notEmpty()) {
assertCond(c.localScope != null);
terms[1].defineClass(c, null);
Enumeration en = terms[1].getSignature().elements();
while (en.hasMoreElements()) {
c.forceVmExc |= ((ClassDefinition) en.nextElement())
.getVMExcMask();
}
}
ObjQueue names = new ObjQueue();
terms[0].assignedVarNames(names, true);
c.currentMethod.resetLocalsActualType(c, names, true);
accessedOuterObjLocals = new ObjHashSet();
ObjHashSet oldChangedVars = c.curTryChangedVars;
c.curTryChangedVars = new ObjHashSet();
c.isConditional = true;
BranchContext oldBranch = c.saveBranch();
terms[0].processPass1(c);
c.intersectBranch(oldBranch);
c.forceVmExc = oldForceVmExc;
if (c.curTryChangedVars.size() > 0) {
changedVars = c.curTryChangedVars;
}
c.curTryChangedVars = oldChangedVars;
c.currentTry = currentTry;
ObjQueue innerVars = new ObjQueue();
Enumeration en = accessedOuterObjLocals.elements();
while (en.hasMoreElements()) {
VariableDefinition v = (VariableDefinition) en.nextElement();
if (c.currentMethod.getLocalVar(v.id()) == null) {
innerVars.addLast(v);
}
}
Enumeration en2 = innerVars.elements();
while (en2.hasMoreElements()) {
accessedOuterObjLocals.remove(en2.nextElement());
}
catchesSuffix = "";
if (terms[1].notEmpty()) {
catchesSuffix = c.currentMethod.nextLabelSuffix();
terms[1].processPass1(c);
}
if (oldChangedVars != null && changedVars != null
&& !terms[2].notEmpty()) {
Enumeration en3 = changedVars.elements();
while (en3.hasMoreElements()) {
oldChangedVars.add(en3.nextElement());
}
}
} else {
terms[0].processPass1(c);
c.currentTry = currentTry;
}
boolean oldBreakableHidden = c.breakableHidden;
c.breakableHidden = true;
terms[2].processPass1(c);
c.breakableHidden = oldBreakableHidden;
}
final void setVarAccessed(VariableDefinition v) {
if (accessedOuterObjLocals != null) {
if (v.isLocalOrParam()) {
if (v.exprType().objectSize() >= Type.CLASSINTERFACE) {
accessedOuterObjLocals.add(v);
}
} else if (!v.isClassVariable()) {
isThisAccessed = true;
}
}
}
boolean hasTailReturnOrThrow() {
return terms[2].notEmpty() ? terms[2].hasTailReturnOrThrow() : terms[0]
.hasTailReturnOrThrow() && terms[1].hasTailReturnOrThrow();
}
void discoverObjLeaks() {
terms[0].discoverObjLeaks();
if (terms[2].notEmpty() ? Main.dict.get(Names.JAVA_LANG_THROWABLE)
.used() : hasExceptionInstances()) {
if (changedVars != null) {
Enumeration en = changedVars.elements();
changedVars = null;
while (en.hasMoreElements()) {
((VariableDefinition) en.nextElement()).setChangedSpecial();
}
}
if (accessedOuterObjLocals != null) {
Enumeration en = accessedOuterObjLocals.elements();
while (en.hasMoreElements()) {
((VariableDefinition) en.nextElement())
.setStackObjVolatile();
}
if (isThisAccessed) {
assertCond(callerClass != null);
if (Main.dict.ourMethod != null) {
Main.dict.ourMethod.setThisStackObjVolatile();
} else {
callerClass.setInitThisStackObjVolatile();
}
}
}
}
terms[1].discoverObjLeaks();
terms[2].discoverObjLeaks();
}
private boolean hasExceptionInstances() {
Enumeration en = terms[1].getSignature().elements();
while (en.hasMoreElements()) {
if (((ClassDefinition) en.nextElement()).hasRealInstances())
return true;
}
return false;
}
static void outputFinallyGroup(TryStatement curTry, TryStatement lastTry,
OutputContext oc, String code) {
boolean needsEnd = false;
if (curTry != null && curTry.outputFinallyGroupInner(oc, lastTry, true)) {
if (oc.insideNotSehTry)
return;
oc.cPrint("\n#else\010");
needsEnd = true;
}
oc.cPrint(code);
oc.cPrint(";");
if (needsEnd) {
oc.cPrint("\n#endif\010");
}
}
final boolean outputFinallyGroupInner(OutputContext oc,
TryStatement lastTry, boolean allowBreakThrow) {
if (lastTry == this)
return false;
boolean oldInsideNotSehTry = oc.insideNotSehTry;
if (!oldInsideNotSehTry) {
oc.cPrint("\n#ifndef JCGO_SEHTRY\010");
oc.insideNotSehTry = true;
}
TryStatement ts = this;
do {
assertCond(ts != null);
if (ts.outputFinallyCode(oc)) {
if (!allowBreakThrow && !ts.terms[2].isReturnAtEnd(false))
break;
oc.insideNotSehTry = oldInsideNotSehTry;
return true;
}
} while ((ts = ts.currentTry) != lastTry);
if (!oldInsideNotSehTry) {
oc.insideNotSehTry = false;
oc.cPrint("\n#endif\010");
}
return false;
}
boolean outputFinallyCode(OutputContext oc) {
if (catchesSuffix == null)
return false;
oc.cPrint("jcgo_tryLeave();");
terms[2].processOutput(oc);
return terms[2].isReturnAtEnd(true);
}
boolean isReturnAtEnd(boolean allowBreakThrow) {
return terms[2].notEmpty() ? terms[2].isReturnAtEnd(allowBreakThrow)
: terms[0].isReturnAtEnd(allowBreakThrow)
&& !hasExceptionInstances();
}
void processOutput(OutputContext oc) {
if (terms[2].notEmpty() ? Main.dict.get(Names.JAVA_LANG_THROWABLE)
.used() : (!terms[1].isSwitchMapAssign(false) || !terms[0]
.isSwitchMapAssign(false)) && hasExceptionInstances()) {
oc.cPrint("{JCGO_TRY_BLOCK");
terms[0].processOutput(oc);
oc.cPrint("JCGO_TRY_LEAVE\010");
if (terms[1].notEmpty()) {
assertCond(catchesSuffix != null);
oc.cPrint("JCGO_TRY_CATCHES(");
oc.cPrint(catchesSuffix);
oc.cPrint(")\010");
terms[1].processOutput(oc);
oc.cPrint("JCGO_TRY_RETHROW(");
oc.cPrint(catchesSuffix);
oc.cPrint(")\010");
} else {
terms[2].processOutput(oc);
if (!terms[2].isReturnAtEnd(true)) {
oc.cPrint("JCGO_TRY_FINALLYEND\010");
}
}
oc.cPrint("}");
} else {
catchesSuffix = null;
terms[0].processOutput(oc);
terms[2].processOutput(oc);
}
}
}