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spins-ltsmin-deb
spins-ltsmin-deb
Commit 8e0eb28f authored by Alfons Laarman's avatar Alfons Laarman
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Support structs in channels

parent 41d0d5a6
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Showing with 292 additions and 117 deletions
src/spins/promela/compiler/expression/Identifier.java
View file @ 8e0eb28f
......@@ -101,6 +101,10 @@ public class Identifier extends Expression {
this.sub = null;
}
public Identifier(Identifier id) {
this(id.getToken(), id.var, id.getArrayExpr(), id.sub);
}
public Identifier(Identifier id, Identifier sub) {
this(id.getToken(), id.var, id.getArrayExpr(), sub);
}
......@@ -118,7 +122,7 @@ public class Identifier extends Expression {
*/
public Expression getArrayExpr() {
if ((null == arrayExpr) != (-1 == var.getArraySize()))
throw new AssertionError("Invalid array semantics in expression: "+ this);
throw new AssertionError("Invalid array semantics in expression: "+ this+ ". Array size is: "+ var.getArraySize());
return arrayExpr;
}
......@@ -187,7 +191,7 @@ public class Identifier extends Expression {
res = var.toString() + "[" + arrayExpr.toString() + "]";
} else {
assert (false);
res = var.toString() + "[0]";
res = var.toString() + "[??]";
}
} else {
res = var.toString();
......
src/spins/promela/compiler/ltsmin/LTSminDMWalker.java
View file @ 8e0eb28f
package spins.promela.compiler.ltsmin;
import java.util.List;
import java.util.Map;
import static spins.promela.compiler.Specification._NR_PR;
import static spins.promela.compiler.ltsmin.util.LTSminUtil.chanLength;
import static spins.promela.compiler.ltsmin.util.LTSminUtil.channelBottom;
import static spins.promela.compiler.ltsmin.util.LTSminUtil.channelIndex;
import static spins.promela.compiler.ltsmin.util.LTSminUtil.channelNext;
import static spins.promela.compiler.ltsmin.util.LTSminUtil.id;
import java.util.List;
import java.util.Map;
import spins.promela.compiler.Proctype;
import spins.promela.compiler.actions.Action;
import spins.promela.compiler.actions.AssertAction;
......@@ -57,6 +58,8 @@ import spins.promela.compiler.ltsmin.util.LTSminRendezVousException;
import spins.promela.compiler.parser.ParseException;
import spins.promela.compiler.parser.PromelaConstants;
import spins.promela.compiler.variable.ChannelType;
import spins.promela.compiler.variable.ChannelVariable;
import spins.promela.compiler.variable.CustomVariableType;
import spins.promela.compiler.variable.Variable;
import spins.promela.compiler.variable.VariableType;
......@@ -102,11 +105,15 @@ public class LTSminDMWalker {
private static Params sParams = new Params(null, null, DUMMY_MATRIX,
0, DUMMY_OPTIONS);
public static void walkOneGuard(LTSminModel model, DepMatrix dm,
Expression e, int num) {
Expression e, int num, MarkAction mark) {
sParams.model = model;
sParams.depMatrix.read = dm;
sParams.trans = num;
walkExpression(sParams, e, MarkAction.READ);
try {
walkExpression(sParams, e, mark);
} catch (AssertionError ae) {
throw new AssertionError("Guard failed: "+ e +"\n"+ ae);
}
}
static void walkModel(LTSminModel model, LTSminDebug debug, Options opts) {
......@@ -161,7 +168,7 @@ public class LTSminDMWalker {
report.setTotal(nLabels * nSlots);
for (int i = 0; i < nLabels; i++) {
LTSminGuard g = guardInfo.get(i);
LTSminDMWalker.walkOneGuard(model, gm, g.expr, i);
LTSminDMWalker.walkOneGuard(model, gm, g.expr, i, MarkAction.READ);
reads += gm.getRow(i).getCardinality();
report.updateProgress(nSlots);
}
......@@ -222,7 +229,13 @@ public class LTSminDMWalker {
Params p = new Params(params.model, null, a2s, -1, params.opts);
for (Action a : params.model.getActions()) {
p.trans = a.getIndex();
walkAction (p, a);
try {
walkAction (p, a);
} catch (AssertionError ae) {
throw new AssertionError("Walk Action failed: "+ a +"\n"+ ae);
}
RWDepRow row = a2s.getRow(a.getIndex());
reads += row.readCardinality();
mayWrites += row.mayWriteCardinality();
......@@ -524,13 +537,19 @@ public class LTSminDMWalker {
} else if(e instanceof ChannelReadExpression) {
ChannelReadExpression cre = (ChannelReadExpression)e;
Identifier id = cre.getIdentifier();
ChannelVariable cv = (ChannelVariable) id.getVariable();
ChannelType ct = cv.getType();
// mark variables as read
int m = 0;
for (Expression expr : cre.getExprs()) {
Expression read = cre.isRandom() ? channelIndex(id, STAR, m) :
channelBottom(id, m);
walkExpression(params, read, mark);
walkExpression(params, expr, mark);
if (ct.getTypes().get(m) instanceof CustomVariableType) {
walkExpression(params, expr, MarkAction.EREAD);
} else {
walkExpression(params, expr, mark);
}
m++;
}
walkExpression(params, chanLength(id), mark);
......
src/spins/promela/compiler/ltsmin/LTSminGMWalker.java
View file @ 8e0eb28f
package spins.promela.compiler.ltsmin;
import static spins.promela.compiler.Specification._NR_PR;
import static spins.promela.compiler.ltsmin.LTSminPrinter.ICE_DM_NAME;
import static spins.promela.compiler.ltsmin.LTSminPrinter.MDS_DM_NAME;
import static spins.promela.compiler.ltsmin.LTSminPrinter.MES_DM_NAME;
import static spins.promela.compiler.ltsmin.LTSminPrinter.ICE_DM_NAME;
import static spins.promela.compiler.ltsmin.util.LTSminUtil.assign;
import static spins.promela.compiler.ltsmin.util.LTSminUtil.chanLength;
import static spins.promela.compiler.ltsmin.util.LTSminUtil.decr;
......@@ -36,6 +36,7 @@ import spins.promela.compiler.expression.Expression;
import spins.promela.compiler.expression.Identifier;
import spins.promela.compiler.expression.RunExpression;
import spins.promela.compiler.expression.TimeoutExpression;
import spins.promela.compiler.ltsmin.LTSminDMWalker.MarkAction;
import spins.promela.compiler.ltsmin.LTSminTreeWalker.Options;
import spins.promela.compiler.ltsmin.matrix.DepMatrix;
import spins.promela.compiler.ltsmin.matrix.DepMatrix.DepRow;
......@@ -53,7 +54,10 @@ import spins.promela.compiler.ltsmin.util.SimplePredicate;
import spins.promela.compiler.parser.ParseException;
import spins.promela.compiler.parser.PromelaTokenManager;
import spins.promela.compiler.variable.ChannelType;
import spins.promela.compiler.variable.ChannelVariable;
import spins.promela.compiler.variable.CustomVariableType;
import spins.promela.compiler.variable.Variable;
import spins.promela.compiler.variable.VariableType;
/**
* A container for boolean state labels (part of which are guards), guard
......@@ -471,7 +475,7 @@ guard_loop: for (int g2 : guardInfo.getTransMatrix().get(t2)) {
if (missed) {
RWMatrix deps = model.getDepMatrix();
DepMatrix temp = new DepMatrix(1, model.sv.size());
LTSminDMWalker.walkOneGuard(model, temp, e, 0);
LTSminDMWalker.walkOneGuard(model, temp, e, 0, MarkAction.READ);
return deps.getRow(t.getGroup()).mayWrites(temp.getRow(0));
}
for (SimplePredicate sp : sps) {
......@@ -493,7 +497,7 @@ guard_loop: for (int g2 : guardInfo.getTransMatrix().get(t2)) {
for (Action a : t.getActions()) {
testSet.clear();
LTSminDMWalker.walkOneGuard(model, testSet, sp.e, 0);
LTSminDMWalker.walkOneGuard(model, testSet, sp.e, 0, MarkAction.READ);
RWDepRow writeSet = a2s.getRow(a.getIndex());
if (!writeSet.mayWrites(testSet.getRow(0)))
continue;
......@@ -590,7 +594,7 @@ guard_loop: for (int g2 : guardInfo.getTransMatrix().get(t2)) {
for (Action a : t.getActions()) {
testSet.clear();
LTSminDMWalker.walkOneGuard(model, testSet, sp.e, 0);
LTSminDMWalker.walkOneGuard(model, testSet, sp.e, 0, MarkAction.READ);
RWDepRow writeSet = a2s.getRow(a.getIndex());
if (!writeSet.mayWrites(testSet.getRow(0)))
continue;
......@@ -967,11 +971,20 @@ guard_loop: for (int g2 : guardInfo.getTransMatrix().get(t2)) {
throw new ParseException();
} else if(a instanceof ChannelSendAction) {
ChannelSendAction csa = (ChannelSendAction)a;
Identifier id = csa.getIdentifier();
Identifier id = csa.getIdentifier();
ChannelVariable cv = (ChannelVariable) id.getVariable();
ChannelType ct = cv.getType();
int m = 0;
for (Expression e : csa.getExprs()) {
if (depCheck(model, e, deps.mayWrite))
throw new ParseException();
VariableType msg = ct.getTypes().get(m++);
if (msg instanceof CustomVariableType) {
if (depCheck(model, e, deps.mayWrite, MarkAction.EREAD))
throw new ParseException();
} else {
if (depCheck(model, e, deps.mayWrite))
throw new ParseException();
}
}
if (!depCheck(model, chanLength(id), deps))
......@@ -988,11 +1001,22 @@ guard_loop: for (int g2 : guardInfo.getTransMatrix().get(t2)) {
} else if(a instanceof ChannelReadAction) {
ChannelReadAction cra = (ChannelReadAction)a;
Identifier id = cra.getIdentifier();
ChannelVariable cv = (ChannelVariable) id.getVariable();
ChannelType ct = cv.getType();
int m = 0;
for (Expression e : cra.getExprs()) {
if ( e instanceof Identifier &&
depCheck(model, e, deps))
throw new ParseException();
m++;
if (!(e instanceof Identifier)) continue;
VariableType msg = ct.getTypes().get(m - 1);
if (msg instanceof CustomVariableType) {
if (depCheck(model, e, deps, MarkAction.EREAD))
throw new ParseException();
} else {
if (depCheck(model, e, deps))
throw new ParseException();
}
}
if (!depCheck(model, chanLength(id), deps))
......@@ -1154,7 +1178,7 @@ guard_loop: for (int g2 : guardInfo.getTransMatrix().get(t2)) {
DepRow limit = limit1 != null ? limit1 : limit2;
Expression e = limit1 != null ? e1 : e2;
DepMatrix testSet = new DepMatrix(1, model.sv.size());
LTSminDMWalker.walkOneGuard(model, testSet, e, 0);
LTSminDMWalker.walkOneGuard(model, testSet, e, 0, MarkAction.READ);
if (!testSet.getRow(0).isDependent(limit)) return null;
}
List<SimplePredicate> ga_sp = new ArrayList<SimplePredicate>();
......
src/spins/promela/compiler/ltsmin/LTSminPrinter.java
View file @ 8e0eb28f
......@@ -25,6 +25,7 @@ import static spins.promela.compiler.ltsmin.util.LTSminUtil.incr;
import static spins.promela.compiler.ltsmin.util.LTSminUtil.not;
import static spins.promela.compiler.ltsmin.util.LTSminUtil.print;
import static spins.promela.compiler.ltsmin.util.LTSminUtil.printPC;
import static spins.promela.compiler.ltsmin.LTSminTreeWalker.createCustomIdentifiers;
import static spins.promela.compiler.parser.PromelaConstants.ASSIGN;
import static spins.promela.compiler.parser.PromelaConstants.DECR;
import static spins.promela.compiler.parser.PromelaConstants.FALSE;
......@@ -94,7 +95,9 @@ import spins.promela.compiler.parser.ParseException;
import spins.promela.compiler.parser.PromelaConstants;
import spins.promela.compiler.variable.ChannelType;
import spins.promela.compiler.variable.ChannelVariable;
import spins.promela.compiler.variable.CustomVariableType;
import spins.promela.compiler.variable.Variable;
import spins.promela.compiler.variable.VariableType;
import spins.util.IndexedSet;
import spins.util.StringWriter;
......@@ -525,8 +528,13 @@ public class LTSminPrinter {
w.appendPostfix();
List<Action> actions = t.getActions();
for(Action a: actions)
generateAction(w,a,model, t);
for(Action a: actions) {
try {
generateAction(w,a,model, t);
} catch (AssertionError ae) {
throw new AssertionError("Generating action failed for "+ a +"\n"+ ae);
}
}
// No edge labels! They are discarded anyway!
w.appendLine("transition_info.group = "+ t.getGroup() +";");
if (t.getEnd().liesOnCycle()) {
......@@ -660,8 +668,13 @@ public class LTSminPrinter {
LTSminModel model) {
w.appendLine("memcpy(", OUT_VAR,", ", IN_VAR , ", sizeof(", C_STATE,"));");
List<Action> actions = t.getActions();
for(Action a : actions)
generateAction(w,a,model, t);
for(Action a : actions) {
try {
generateAction(w, a, model, t);
} catch (AssertionError ae) {
throw ae;//new AssertionError("Generating action failed for "+ a +"\n"+ ae);
}
}
if (t.isAtomic()) {
printEdgeLabels (w, model, t);
w.appendLine("transition_info.group = "+ t.getGroup() +";");
......@@ -1045,36 +1058,44 @@ public class LTSminPrinter {
int bufferSize = var.getType().getBufferSize();
List<Expression> exprs = csa.getExprs();
String len = print(chanLength(id), out(model));
ChannelVariable cv = (ChannelVariable) id.getVariable();
ChannelType ct = cv.getType();
if (csa.isSorted() && bufferSize > 1) {
Identifier index = new LTSminIdentifier(model.index);
Expression min = calc(PromelaConstants.MINUS, index, constant(1));
Identifier m0 = channelIndex(id, min, 0);
Expression comp = compare(PromelaConstants.LTE, m0, exprs.get(0));
String test = print(comp, out(model));
w.appendLine("for (i = "+ len +"; i > 0; i--) {");
w.indent();
w.appendLine("if ("+ test +") break;");
for (int e = 0; e < exprs.size(); e++) {
Identifier m = channelIndex(id, index, e);
Identifier mmm = channelIndex(id, min, e);
generateAction(w, assign(m, mmm), model, t);
}
w.outdent();
w.appendLine("}");
Identifier index = new LTSminIdentifier(model.index);
Expression min = calc(PromelaConstants.MINUS, index, constant(1));
Identifier m0 = channelIndex(id, min, 0);
Expression comp = compare(PromelaConstants.LTE, m0, exprs.get(0));
String test = print(comp, out(model));
w.appendLine("for (i = "+ len +"; i > 0; i--) {");
w.indent();
w.appendLine("if ("+ test +") break;");
for (int e = 0; e < exprs.size(); e++) {
Identifier m = channelIndex(id, index, e);
Identifier mmm = channelIndex(id, min, e);
VariableType msg = ct.getTypes().get(e);
generateChanBufCopy(w, model, t, m, mmm, msg);
//generateAction(w, assign(m, mmm), model, t);
}
w.outdent();
w.appendLine("}");
for (int e = 0; e < exprs.size(); e++) {
final Expression expr = exprs.get(e);
Identifier buf = channelIndex(id,index,e);
generateAction(w, assign(buf, expr), model, t);
}
} else {
for (int e = 0; e < exprs.size(); e++) {
final Expression expr = exprs.get(e);
Identifier buf = channelNext(id,e);
generateAction(w, assign(buf, expr), model, t);
}
for (int e = 0; e < exprs.size(); e++) {
final Expression expr = exprs.get(e);
Identifier buf = channelIndex(id,index,e);
VariableType msg = ct.getTypes().get(e);
generateChanBufCopy(w, model, t, buf, expr, msg);
//generateAction(w, assign(buf, expr), model, t);
}
} else {
for (int e = 0; e < exprs.size(); e++) {
final Expression expr = exprs.get(e);
Identifier buf = channelNext(id,e);
VariableType msg = ct.getTypes().get(e);
generateChanBufCopy(w, model, t, buf, expr, msg);
//generateAction(w, assign(buf, expr), model, t);
}
}
generateAction(w, incr(chanLength(id)), model, t);
} else if (a instanceof ChannelReadAction) {
......@@ -1098,14 +1119,18 @@ public class LTSminPrinter {
} else {
w.appendLine("j = 0;");
}
for (int e = 0; e < exprs.size(); e++) {
ChannelVariable cv = (ChannelVariable) id.getVariable();
ChannelType ct = cv.getType();
for (int e = 0; e < exprs.size(); e++) {
final Expression expr = exprs.get(e);
if (expr instanceof Identifier) {
Identifier p = (Identifier)expr;
Expression m = channelBottom(id, e);
generateAction(w, assign(p, m), model, t);
}
if (!(expr instanceof Identifier)) continue;
Identifier lhs = (Identifier)expr;
Identifier m = channelBottom(id, e);
VariableType msg = ct.getTypes().get(e);
generateChanBufCopy(w, model, t, lhs, m, msg);
}
if (cra.isRandom()) {
w.appendLine("break;");
w.outdent();
......@@ -1121,14 +1146,25 @@ public class LTSminPrinter {
for (int e = 0; e < exprs.size(); e++) {
Identifier m = channelIndex(id, index, e);
Identifier mpp = channelIndex(id, pp, e);
generateAction(w, assign(m, mpp), model, t);
VariableType msg = ct.getTypes().get(e);
generateChanBufCopy(w, model, t, m, mpp, msg);
//generateAction(w, assign(m, mpp), model, t);
}
w.outdent();
w.appendLine("}");
}
generateAction(w, decr(chanLength(id)), model, t);
for (int e = 0; e < exprs.size(); e++) {
generateAction(w, assign(channelNext(id,e), constant(0)), model, t);
VariableType msg = ct.getTypes().get(e);
Identifier buf = channelNext(id,e);
if (msg instanceof CustomVariableType) {
List<Identifier> l1 = createCustomIdentifiers(msg, buf);
for (Identifier id1 : l1) {
generateAction(w, assign(id1, constant(0)), model, t);
}
} else {
generateAction(w, assign(buf, constant(0)), model, t);
}
}
}
} else {
......@@ -1136,11 +1172,27 @@ public class LTSminPrinter {
}
}
private static void generateChanBufCopy(StringWriter w, LTSminModel model, LTSminTransition t,
Identifier lhs, Expression rhs, VariableType msg) {
if (msg instanceof CustomVariableType) {
if (!(rhs instanceof Identifier)) throw new AssertionError("Expected identifier in rhs of channel XXX action buffer mod for: "+ lhs +" := "+ rhs);
Identifier R = (Identifier)rhs;
List<Identifier> l1 = createCustomIdentifiers(msg, lhs);
List<Identifier> l2 = createCustomIdentifiers(msg, R);
Iterator<Identifier> it2 = l2.listIterator();
for (Identifier id1 : l1) {
generateAction(w, assign(id1, it2.next()), model, t);
}
} else {
generateAction(w, assign(lhs, rhs), model, t);
}
}
private static void copyAccess(LTSminModel model, StringWriter w, Identifier id) {
if (id.getVariable().isHidden() || id instanceof LTSminIdentifier) return;
if (id.isConstant()) return;
String var = print(id, out(model));
String var = print(id, out(model));
if (!var.endsWith(".var")) throw new AssertionError(var +" does not end with '.var'");
String pad = var.substring(0, var.length() - 4) +".pad";
......@@ -1199,7 +1251,13 @@ public class LTSminPrinter {
w.append(id.getVariable().getName());
} else if(e instanceof Identifier) {
Identifier id = (Identifier)e;
w.append(print(id, state));
try {
w.append(print(id, state));
} catch (AssertionError ae) {
System.err.println(id);
ae.printStackTrace();
new AssertionError("Generating id failed for "+ id +"\n"+ ae);
}
} else if(e instanceof AritmicExpression) {
AritmicExpression ae = (AritmicExpression)e;
Expression ex1 = ae.getExpr1();
......
src/spins/promela/compiler/ltsmin/LTSminTreeWalker.java
View file @ 8e0eb28f
......@@ -113,6 +113,7 @@ import spins.promela.compiler.parser.PromelaConstants;
import spins.promela.compiler.parser.Token;
import spins.promela.compiler.variable.ChannelType;
import spins.promela.compiler.variable.ChannelVariable;
import spins.promela.compiler.variable.CustomVariableType;
import spins.promela.compiler.variable.Variable;
import spins.promela.compiler.variable.VariableType;
......@@ -147,10 +148,10 @@ public class LTSminTreeWalker {
private void replaceVars(Variable v, Identifier id) {
for (Identifier i : ids) {
if (i.getVariable() == v) {
i.setVariable(id.getVariable());
if (i.getArrayExpr() != null)
throw new AssertionError("Not a lhs var place holder: "+ i +" = "+ id);
i.setArrayIndex(id.getArrayExpr());
i.setVariable(id.getVariable());
}
}
}
......@@ -1475,51 +1476,90 @@ public class LTSminTreeWalker {
// create transitions for all items in a channel array
for (int x = 0; x < (arraySize == -1 || !SPLIT ? 1 : arraySize); x++) {
LTSminTransition lt = new LTSminTransition(sa.t, n);
lt.setSync(ra.t);
lt.addGuard(pcGuard(sa.t.getFrom(), sa.p));
lt.addGuard(pcGuard(ra.t.getFrom(), ra.p));
addSpecialGuards(lt, sa.t, sa.p); // proc die order && provided condition
addSpecialGuards(lt, ra.t, ra.p); // proc die order && provided condition
if (arraySize > -1) { // array of channels
if (SPLIT)
lt.addGuard(compare(PromelaConstants.EQ, array1, constant(x)));
lt.addGuard(compare(PromelaConstants.EQ, array1, array2));
}
/* Channel matches */
for (int i = 0; i < cra_exprs.size(); i++) {
final Expression csa_expr = csa_exprs.get(i);
final Expression cra_expr = cra_exprs.get(i);
if (!(cra_expr instanceof Identifier)) {
lt.addGuard(compare(PromelaConstants.EQ,csa_expr,cra_expr));
}
}
if (addNever(lt, n)) {
set.add(lt);
continue;
}
lt.setSync(ra.t);
lt.addGuard(pcGuard(sa.t.getFrom(), sa.p));
lt.addGuard(pcGuard(ra.t.getFrom(), ra.p));
addSpecialGuards(lt, sa.t, sa.p); // proc die order && provided condition
addSpecialGuards(lt, ra.t, ra.p); // proc die order && provided condition
if (arraySize > -1) { // array of channels
if (SPLIT)
lt.addGuard(compare(PromelaConstants.EQ, array1, constant(x)));
lt.addGuard(compare(PromelaConstants.EQ, array1, array2));
}
/* Channel matches */
for (int i = 0; i < cra_exprs.size(); i++) {
final Expression csa_expr = csa_exprs.get(i);
final Expression cra_expr = cra_exprs.get(i);
if (!(cra_expr instanceof Identifier)) {
lt.addGuard(compare(PromelaConstants.EQ,csa_expr,cra_expr));
}
}
if (addNever(lt, n)) {
set.add(lt);
continue;
}
/* Channel reads */
for (int i = 0; i < cra_exprs.size(); i++) {
final Expression csa_expr = csa_exprs.get(i);
final Expression cra_expr = cra_exprs.get(i);
if (cra_expr instanceof Identifier) {
lt.addAction(assign((Identifier)cra_expr,csa_expr));
Identifier id = cra.getIdentifier();
ChannelVariable cv = (ChannelVariable) id.getVariable();
ChannelType ct = cv.getType();
Identifier cra_id = (Identifier)cra_expr;
VariableType msg = ct.getTypes().get(i);
if (msg instanceof CustomVariableType) {
if (!(csa_expr instanceof Identifier)) throw new AssertionError("Expected id in channel send action. "+ cra +" index "+ i);
Identifier csa_id = (Identifier)csa_expr;
List<Identifier> l1 = createCustomIdentifiers(msg, csa_id);
List<Identifier> l2 = createCustomIdentifiers(msg, cra_id);
Iterator<Identifier> it2 = l2.listIterator();
for (Identifier id1 : l1) {
lt.addAction(assign(it2.next(), id1));
}
} else {
lt.addAction(assign(cra_id,csa_expr));
}
}
}
// Change process counter of sender
lt.addAction(assign(sa.p.getPC(), sa.t.getTo().getStateId()));
// Change process counter of receiver
lt.addAction(assign(ra.p.getPC(), ra.t.getTo().getStateId()));
for (int i = 1; i < ra.t.getActionCount(); i++)
lt.addAction(ra.t.getAction(i));
if (sa.t.getActionCount() > 1) throw new AssertionError("Rendez-vous send action in d_step.");
set.add(lt);
// Change process counter of sender
lt.addAction(assign(sa.p.getPC(), sa.t.getTo().getStateId()));
// Change process counter of receiver
lt.addAction(assign(ra.p.getPC(), ra.t.getTo().getStateId()));
for (int i = 1; i < ra.t.getActionCount(); i++)
lt.addAction(ra.t.getAction(i));
if (sa.t.getActionCount() > 1) throw new AssertionError("Rendez-vous send action in d_step.");