All tests pass with register allocation

teavm-classlib/pom.xml

@@ -52,7 +52,7 @@
             </goals>
             <phase>process-test-classes</phase>
             <configuration>
-              <minifying>true</minifying>
+              <minifying>false</minifying>
             </configuration>
           </execution>
         </executions>

teavm-core/src/main/java/org/teavm/javascript/Decompiler.java

@@ -201,7 +201,7 @@ public class Decompiler {
             methodNode.getVariables().add(program.variableAt(i).getRegister());
         }
         Optimizer optimizer = new Optimizer();
-        optimizer.optimize(methodNode);
+        optimizer.optimize(methodNode, method.getProgram());
         return methodNode;
     }
 

teavm-core/src/main/java/org/teavm/javascript/JavascriptBuilder.java

@@ -37,7 +37,7 @@ public class JavascriptBuilder {
     private DependencyChecker dependencyChecker;
     private ClassLoader classLoader;
     private boolean minifying = true;
-    private boolean bytecodeLogging;
+    private boolean bytecodeLogging = true;
     private OutputStream logStream = System.out;
     private Map<String, JavascriptEntryPoint> entryPoints = new HashMap<>();
     private Map<String, String> exportedClasses = new HashMap<>();

teavm-core/src/main/java/org/teavm/javascript/Optimizer.java

@@ -16,8 +16,7 @@
 package org.teavm.javascript;
 
 import org.teavm.javascript.ast.RegularMethodNode;
-import org.teavm.javascript.ast.Statement;
+import org.teavm.model.Program;
-import org.teavm.model.MethodHolder;
 
 
 /**
@@ -25,17 +24,9 @@ import org.teavm.model.MethodHolder;
  * @author Alexey Andreev
  */
 public class Optimizer {
-    public Statement optimize(MethodHolder method, Statement statement) {
+    public void optimize(RegularMethodNode method, Program program) {
-        ReadWriteStatsBuilder stats = new ReadWriteStatsBuilder(method.getProgram().variableCount());
-        statement.acceptVisitor(stats);
-        OptimizingVisitor optimizer = new OptimizingVisitor(stats);
-        statement.acceptVisitor(optimizer);
-        return optimizer.resultStmt;
-    }
-
-    public void optimize(RegularMethodNode method) {
         ReadWriteStatsBuilder stats = new ReadWriteStatsBuilder(method.getVariables().size());
-        method.getBody().acceptVisitor(stats);
+        stats.analyze(program);
         OptimizingVisitor optimizer = new OptimizingVisitor(stats);
         method.getBody().acceptVisitor(optimizer);
         method.setBody(optimizer.resultStmt);

teavm-core/src/main/java/org/teavm/javascript/OptimizingVisitor.java

@@ -377,7 +377,7 @@ class OptimizingVisitor implements StatementVisitor, ExprVisitor {
         WhileStatement result = new WhileStatement();
         result.setId(statement.getId());
         visitIdentified(statement, result);
-        List<Statement> statements = processSequence(statement.getBody(), false);
+        List<Statement> statements = processSequence(statement.getBody(), true);
         if (statement.getCondition() != null) {
             statement.getCondition().acceptVisitor(this);
             result.setCondition(resultExpr);

teavm-core/src/main/java/org/teavm/javascript/ReadWriteStatsBuilder.java

@@ -15,13 +15,15 @@
  */
 package org.teavm.javascript;
 
-import org.teavm.javascript.ast.*;
+import org.teavm.model.*;
+import org.teavm.model.util.DefinitionExtractor;
+import org.teavm.model.util.UsageExtractor;
 
 /**
  *
  * @author Alexey Andreev
  */
-class ReadWriteStatsBuilder implements StatementVisitor, ExprVisitor {
+class ReadWriteStatsBuilder {
     public int[] reads;
     public int[] writes;
 
@@ -30,169 +32,27 @@ class ReadWriteStatsBuilder implements StatementVisitor, ExprVisitor {
         writes = new int[variableCount];
     }
 
-    @Override
+    public void analyze(Program program) {
-    public void visit(BinaryExpr expr) {
+        DefinitionExtractor defExtractor = new DefinitionExtractor();
-        expr.getFirstOperand().acceptVisitor(this);
+        UsageExtractor useExtractor = new UsageExtractor();
-        expr.getSecondOperand().acceptVisitor(this);
+        for (int i = 0; i < program.basicBlockCount(); ++i) {
+            BasicBlock block = program.basicBlockAt(i);
+            for (Instruction insn : block.getInstructions()) {
+                insn.acceptVisitor(defExtractor);
+                insn.acceptVisitor(useExtractor);
+                for (Variable var : defExtractor.getDefinedVariables()) {
+                    writes[var.getIndex()]++;
                 }
-
+                for (Variable var : useExtractor.getUsedVariables()) {
-    @Override
+                    reads[var.getIndex()]++;
-    public void visit(UnaryExpr expr) {
-        expr.getOperand().acceptVisitor(this);
-    }
-
-    @Override
-    public void visit(ConditionalExpr expr) {
-        expr.getCondition().acceptVisitor(this);
-        expr.getConsequent().acceptVisitor(this);
-        expr.getAlternative().acceptVisitor(this);
-    }
-
-    @Override
-    public void visit(ConstantExpr expr) {
-    }
-
-    @Override
-    public void visit(VariableExpr expr) {
-        reads[expr.getIndex()]++;
-    }
-
-    @Override
-    public void visit(SubscriptExpr expr) {
-        expr.getArray().acceptVisitor(this);
-        expr.getIndex().acceptVisitor(this);
-    }
-
-    @Override
-    public void visit(UnwrapArrayExpr expr) {
-        expr.getArray().acceptVisitor(this);
-    }
-
-    @Override
-    public void visit(InvocationExpr expr) {
-        for (Expr arg : expr.getArguments()) {
-            arg.acceptVisitor(this);
                 }
             }
-
+            for (Phi phi : block.getPhis()) {
-    @Override
+                writes[phi.getReceiver().getIndex()] += phi.getIncomings().size();
-    public void visit(QualificationExpr expr) {
+                for (Incoming incoming : phi.getIncomings()) {
-        expr.getQualified().acceptVisitor(this);
+                    reads[incoming.getValue().getIndex()]++;
-    }
-
-    @Override
-    public void visit(NewExpr expr) {
-    }
-
-    @Override
-    public void visit(NewArrayExpr expr) {
-        expr.getLength().acceptVisitor(this);
-    }
-
-    @Override
-    public void visit(NewMultiArrayExpr expr) {
-        for (Expr dimension : expr.getDimensions()) {
-            dimension.acceptVisitor(this);
                 }
             }
-
-    @Override
-    public void visit(InstanceOfExpr expr) {
-        expr.getExpr().acceptVisitor(this);
         }
-
-    @Override
-    public void visit(StaticClassExpr expr) {
-    }
-
-    @Override
-    public void visit(AssignmentStatement statement) {
-        if (statement.getLeftValue() != null) {
-            if (statement.getLeftValue() instanceof VariableExpr) {
-                VariableExpr leftVar = (VariableExpr)statement.getLeftValue();
-                writes[leftVar.getIndex()]++;
-            } else {
-                statement.getLeftValue().acceptVisitor(this);
-            }
-        }
-        statement.getRightValue().acceptVisitor(this);
-    }
-
-    @Override
-    public void visit(SequentialStatement statement) {
-        for (Statement part : statement.getSequence()) {
-            part.acceptVisitor(this);
-        }
-    }
-
-    @Override
-    public void visit(ConditionalStatement statement) {
-        statement.getCondition().acceptVisitor(this);
-        statement.getConsequent().acceptVisitor(this);
-        if (statement.getAlternative() != null) {
-            statement.getAlternative().acceptVisitor(this);
-        }
-    }
-
-    @Override
-    public void visit(SwitchStatement statement) {
-        statement.getValue().acceptVisitor(this);
-        for (SwitchClause clause : statement.getClauses()) {
-            clause.getStatement().acceptVisitor(this);
-        }
-        if (statement.getDefaultClause() != null) {
-            statement.getDefaultClause().acceptVisitor(this);
-        }
-    }
-
-    @Override
-    public void visit(WhileStatement statement) {
-        if (statement.getCondition() != null) {
-            statement.getCondition().acceptVisitor(this);
-        }
-        for (Statement part : statement.getBody()) {
-            part.acceptVisitor(this);
-        }
-    }
-
-    @Override
-    public void visit(BlockStatement statement) {
-        for (Statement part : statement.getBody()) {
-            part.acceptVisitor(this);
-        }
-    }
-
-    @Override
-    public void visit(ForStatement statement) {
-    }
-
-    @Override
-    public void visit(BreakStatement statement) {
-    }
-
-    @Override
-    public void visit(ContinueStatement statement) {
-    }
-
-    @Override
-    public void visit(ReturnStatement statement) {
-        if (statement.getResult() != null) {
-            statement.getResult().acceptVisitor(this);
-        }
-    }
-
-    @Override
-    public void visit(ThrowStatement statement) {
-        statement.getException().acceptVisitor(this);
-    }
-
-    @Override
-    public void visit(IncrementStatement statement) {
-        reads[statement.getVar()]++;
-        writes[statement.getVar()]++;
-    }
-
-    @Override
-    public void visit(InitClassStatement statement) {
     }
 }

teavm-core/src/main/java/org/teavm/model/util/GraphColorer.java

@@ -35,13 +35,11 @@ class GraphColorer {
             classMembers.get(cls).add(i);
         }
         for (int i = 0; i < colors.length; ++i) {
-            int color = colors[i];
+            if (colors[i] >= 0) {
-            if (color != -1) {
                 int cls = classes[i];
                 for (int member : classMembers.get(cls)) {
-                    colors[member] = color;
+                    colors[member] = colors[i];
                 }
-                classMembers.get(cls).clear();
             }
         }
         BitSet usedColors = new BitSet();
@@ -49,15 +47,18 @@ class GraphColorer {
             if (colors[v] >= 0) {
                 continue;
             }
+            int cls = classes[v];
             usedColors.clear();
             usedColors.set(0);
-            for (int succ : graph.outgoingEdges(v)) {
+            for (int member : classMembers.get(cls)) {
+                for (int succ : graph.outgoingEdges(member)) {
                     if (colors[succ] >= 0) {
                         usedColors.set(colors[succ]);
                     }
                 }
+            }
             int color = usedColors.nextClearBit(0);
-            for (int member : classMembers.get(classes[v])) {
+            for (int member : classMembers.get(cls)) {
                 colors[member] = color;
             }
         }

teavm-core/src/main/java/org/teavm/model/util/InterferenceGraphBuilder.java

@@ -25,7 +25,7 @@ import org.teavm.model.*;
  * @author Alexey Andreev
  */
 class InterferenceGraphBuilder {
-    public Graph build(Program program, LivenessAnalyzer liveness) {
+    public Graph build(Program program, int paramCount, LivenessAnalyzer liveness) {
         List<Set<Integer>> edges = new ArrayList<>();
         for (int i = 0; i < program.variableCount(); ++i) {
             edges.add(new HashSet<Integer>());
@@ -64,6 +64,11 @@ class InterferenceGraphBuilder {
                     live.add(var.getIndex());
                 }
             }
+            if (block.getIndex() == 0) {
+                for (int j = 0; j <= paramCount; ++j) {
+                    edges.get(j).addAll(live);
+                }
+            }
             BitSet liveIn = liveness.liveIn(i);
             live = new HashSet<>();
             for (int j = 0; j < liveOut.length(); ++j) {

teavm-core/src/main/java/org/teavm/model/util/RegisterAllocator.java

@@ -34,7 +34,7 @@ public class RegisterAllocator {
         InterferenceGraphBuilder interferenceBuilder = new InterferenceGraphBuilder();
         LivenessAnalyzer liveness = new LivenessAnalyzer();
         liveness.analyze(program);
-        Graph interferenceGraph = interferenceBuilder.build(program, liveness);
+        Graph interferenceGraph = interferenceBuilder.build(program, method.parameterCount(), liveness);
         DisjointSet congruenceClasses = buildPhiCongruenceClasses(program);
         removeRedundantCopies(program, phiArgsCopies, interferenceGraph, congruenceClasses);
         int[] classArray = congruenceClasses.pack(program.variableCount());