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package com.seaofnodes.simple;
import com.seaofnodes.simple.node.*;
import com.seaofnodes.simple.type.*;
import java.util.*;
import org.junit.Test;
import static org.junit.Assert.*;
public class IRPrinterTest {
private static final String SOURCE = """
int sum=0;
int i=0;
while(i<arg) {
int j=0;
while(j<i) { sum=sum+j; j=j+1; }
i=i+1;
}
return sum;
""";
// No exact whitespace/node-number golden: require a stable, complete
// listing and contiguous Loop/Phi headers, including nested loops.
@Test public void testLoopHeadersAndReadOnlyPrinting() {
Node stop = new Parser(SOURCE).parse();
ArrayList<Node> nodes = inputs(stop);
IdentityHashMap<Node,List<Node>> defs = new IdentityHashMap<>();
IdentityHashMap<Node,List<Node>> uses = new IdentityHashMap<>();
IdentityHashMap<Node,Type> types = new IdentityHashMap<>();
for( Node n : nodes ) {
defs.put(n,copy(n._inputs));
uses.put(n,copy(n._outputs));
types.put(n,n._type);
}
String printed = IRPrinter.prettyPrint(stop,999);
assertEquals(printed,IRPrinter.prettyPrint(stop,999));
List<Integer> ids = ids(printed);
assertEquals(ids.size(),new HashSet<>(ids).size());
int loops = 0;
for( Node n : nodes ) {
assertTrue("missing node " + n._nid,ids.contains(n._nid));
assertEquals(defs.get(n),copy(n._inputs));
assertEquals(uses.get(n),copy(n._outputs));
assertSame(types.get(n),n._type);
if( !(n instanceof LoopNode) ) continue;
loops++;
ArrayList<Node> phis = new ArrayList<>();
for( Node use : n._outputs )
if( use instanceof PhiNode && use._inputs.get(0)==n ) phis.add(use);
phis.sort(Comparator.comparingInt(p -> p._nid));
int idx = ids.indexOf(n._nid);
for( Node phi : phis ) assertEquals(Integer.valueOf(phi._nid),ids.get(++idx));
}
assertTrue("nested source loops must remain",loops>=2);
}
@Test(timeout=5000) public void testBrokenGraphs() {
Node stop = new Parser(SOURCE).parse();
// No entry control or backedge yet, and no reverse edge for the Phi.
LoopNode loop = new LoopNode(null);
PhiNode phi = new PhiNode("x",loop,null,null);
loop._outputs.clear();
List<Integer> header = ids(IRPrinter.prettyPrint(phi,0));
assertEquals(Arrays.asList(loop._nid,phi._nid),header);
// An orphan projection's label may itself dereference missing inputs.
ProjNode proj = new ProjNode(null,0,"broken");
assertTrue(ids(IRPrinter.prettyPrint(proj,0)).contains(proj._nid));
// A data cycle with no roots must terminate and print both nodes once.
AddNode a = new AddNode(null,null);
AddNode b = new AddNode(a,null);
a._inputs.set(1,b);
a._outputs.add(null); // keep edge
List<Integer> cycle = ids(IRPrinter.prettyPrint(a,999));
assertEquals(2,cycle.size());
assertTrue(cycle.contains(a._nid));
assertTrue(cycle.contains(b._nid));
a._inputs.clear();
assertTrue(ids(IRPrinter.prettyPrint(a,999)).contains(a._nid));
assertEquals("",IRPrinter.prettyPrint(null,999));
}
@Test public void testProjectionOrderAndSpacing() {
new Parser("return 0;").parse();
IfNode multi = new IfNode(null,null);
ProjNode p2 = new ProjNode(multi,2,"two");
ProjNode pm = new ProjNode(multi,-1,"minus");
ProjNode p1 = new ProjNode(multi,1,"one");
ProjNode p0 = new ProjNode(multi,0,"zero");
String printed = IRPrinter.prettyPrint(p2,0);
assertEquals(Arrays.asList(multi._nid,pm._nid,p0._nid,p1._nid,p2._nid),ids(printed));
String[] lines = printed.split("\n");
int first = line(lines,multi);
assertTrue(first>0 && lines[first-1].isBlank());
assertEquals(first+1,line(lines,pm));
assertEquals(first+2,line(lines,p0));
assertEquals(first+3,line(lines,p1));
assertEquals(first+4,line(lines,p2));
}
@Test public void testNestedLoopRpo() {
new Parser("return 0;").parse();
LoopNode outer = new LoopNode(null);
LoopNode inner = new LoopNode(outer);
PhiNode op = new PhiNode("outer",outer,null,null);
PhiNode ip = new PhiNode("inner",inner,null,null);
AddNode innerValue = new AddNode(ip,null);
AddNode outerValue = new AddNode(ip,op);
ip._inputs.set(2,innerValue);
op._inputs.set(2,outerValue);
IfNode branch = new IfNode(inner,ip);
ProjNode left = new ProjNode(branch,0,"left");
ProjNode right = new ProjNode(branch,1,"right");
RegionNode join = new RegionNode(null,left,right);
IfNode innerLatch = new IfNode(join,ip);
ProjNode innerBack = new ProjNode(innerLatch,0,"innerBack");
ProjNode innerExit = new ProjNode(innerLatch,1,"innerExit");
inner._inputs.set(2,innerBack);
IfNode outerLatch = new IfNode(innerExit,op);
ProjNode outerBack = new ProjNode(outerLatch,0,"outerBack");
ProjNode outerExit = new ProjNode(outerLatch,1,"outerExit");
outer._inputs.set(2,outerBack);
IfNode after = new IfNode(outerExit,op);
// Raw input edits deliberately leave incomplete reverse edges.
String printed = IRPrinter.prettyPrint(after,999);
List<Integer> ids = ids(printed);
assertEquals(ids.size(),new HashSet<>(ids).size());
before(ids,outer,inner);
before(ids,inner,branch);
before(ids,branch,join);
before(ids,join,innerLatch);
before(ids,innerLatch,outerLatch);
before(ids,innerValue,outerValue);
before(ids,innerLatch,outerValue);
before(ids,outerValue,outerLatch);
before(ids,outerLatch,after);
assertEquals(Integer.valueOf(ip._nid),ids.get(ids.indexOf(inner._nid)+1));
assertEquals(Integer.valueOf(op._nid),ids.get(ids.indexOf(outer._nid)+1));
String[] lines = printed.split("\n");
for( Node cfg : new Node[]{outer,inner,branch,join,innerLatch,outerLatch,after} ) {
int idx=line(lines,cfg);
assertTrue("blank before CFG " + cfg._nid,idx>0 && lines[idx-1].isBlank());
}
assertEquals(line(lines,branch)+1,line(lines,left));
assertEquals(line(lines,branch)+2,line(lines,right));
}
private static void before(List<Integer> ids, Node a, Node b) {
assertTrue("missing " + a._nid,ids.contains(a._nid));
assertTrue("missing " + b._nid,ids.contains(b._nid));
assertTrue(a._nid + " before " + b._nid,ids.indexOf(a._nid)<ids.indexOf(b._nid));
}
private static int line(String[] lines, Node n) {
for( int i=0; i<lines.length; i++ )
if( lines[i].trim().startsWith(n._nid+" ") ) return i;
fail("missing line " + n._nid);
return -1;
}
private static List<Integer> ids(String text) {
ArrayList<Integer> ids = new ArrayList<>();
for( String line : text.split("\n") ) {
String s = line.trim();
if( !s.isEmpty() && Character.isDigit(s.charAt(0)) )
ids.add(Integer.valueOf(s.split("\\s+",2)[0]));
}
return ids;
}
private static ArrayList<Node> inputs(Node root) {
ArrayList<Node> nodes = new ArrayList<>();
IdentityHashMap<Node,Boolean> seen = new IdentityHashMap<>();
nodes.add(root);
seen.put(root,Boolean.TRUE);
for( int i=0; i<nodes.size(); i++ ) {
Node n = nodes.get(i);
if( n._inputs!=null ) for( Node def : n._inputs )
if( def!=null && seen.put(def,Boolean.TRUE)==null ) nodes.add(def);
}
return nodes;
}
private static List<Node> copy(Iterable<Node> edges) {
ArrayList<Node> copy = new ArrayList<>();
if( edges!=null ) for( Node n : edges ) copy.add(n);
return copy;
}
}
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