C: fix bugs in GC

core/src/main/java/org/teavm/backend/c/CTarget.java

@@ -592,7 +592,7 @@ public class CTarget implements TeaVMTarget, TeaVMCHost {
             String mainMethod = names.forMethod(entryPoint.getMethod());
             context.writer().print(mainMethod + "(");
             context.emit(invocation.getArguments().get(0));
-            context.writer().println(");");
+            context.writer().print(")");
         }
     }
 

core/src/main/java/org/teavm/backend/c/generate/ClassGenerator.java

@@ -32,6 +32,7 @@ import org.teavm.dependency.DependencyInfo;
 import org.teavm.diagnostics.Diagnostics;
 import org.teavm.interop.Address;
 import org.teavm.interop.DelegateTo;
+import org.teavm.interop.NoGcRoot;
 import org.teavm.interop.Structure;
 import org.teavm.model.AnnotationHolder;
 import org.teavm.model.ClassHolder;
@@ -278,7 +279,7 @@ public class ClassGenerator {
             String fieldName = context.getNames().forStaticField(field.getReference());
             fieldsWriter.print("static ").printStrictType(field.getType()).print(" ").print(fieldName)
                     .println(";");
-            if (isReferenceType(field.getType())) {
+            if (isReferenceType(field.getType()) && field.getAnnotations().get(NoGcRoot.class.getName()) == null) {
                 staticFields[staticIndex++] = field.getReference();
             }
 

core/src/main/java/org/teavm/backend/c/generate/CodeGenerationVisitor.java

@@ -102,7 +102,6 @@ public class CodeGenerationVisitor implements ExprVisitor, StatementVisitor {
     private int[] maxTemporaryVariableLevel = new int[5];
     private MethodReference callingMethod;
     private Set<? super String> includes;
-    private int currentPart;
     private boolean end;
     private boolean async;
 
@@ -384,7 +383,11 @@ public class CodeGenerationVisitor implements ExprVisitor, StatementVisitor {
                 writer.print(", ");
 
                 MethodReader method = context.getClassSource().resolve(expr.getMethod());
-                writer.print(names.forMethod(method.getReference()));
+                MethodReference reference = expr.getMethod();
+                if (method != null) {
+                    reference = method.getReference();
+                }
+                writer.print(names.forMethod(reference));
 
                 writer.print("(" + receiver);
                 for (Expr arg : expr.getArguments()) {
@@ -400,10 +403,14 @@ public class CodeGenerationVisitor implements ExprVisitor, StatementVisitor {
             case SPECIAL:
             case STATIC: {
                 MethodReader method = context.getClassSource().resolve(expr.getMethod());
-                if (isWrappedNativeCall(method)) {
+                if (method != null && isWrappedNativeCall(method)) {
                     generateWrappedNativeCall(method, expr);
                 } else {
-                    writer.print(names.forMethod(method.getReference()));
+                    MethodReference reference = expr.getMethod();
+                    if (method != null) {
+                        reference = method.getReference();
+                    }
+                    writer.print(names.forMethod(reference));
 
                     writer.print("(");
                     if (!expr.getArguments().isEmpty()) {

core/src/main/java/org/teavm/model/lowlevel/GCShadowStackContributor.java

@@ -81,7 +81,7 @@ public class GCShadowStackContributor {
         int usedColors = 0;
         for (int var = 0; var < colors.length; ++var) {
             if (spilled[var]) {
-                usedColors = Math.max(usedColors, colors[var]);
+                usedColors = Math.max(usedColors, colors[var] + 1);
                 colors[var]--;
             }
         }

core/src/main/java/org/teavm/model/optimization/RedundantNullCheckElimination.java

@@ -50,7 +50,7 @@ public class RedundantNullCheckElimination implements MethodOptimization {
                 } else if (nullness.isNull(nullCheck.getValue())) {
                     block.detachSuccessors();
                     while (nullCheck.getNext() != null) {
-                        nullCheck.delete();
+                        nullCheck.getNext().delete();
                     }
 
                     nullCheck.insertPreviousAll(ProgramUtils.createThrowNPEInstructions(

core/src/main/java/org/teavm/model/util/PhiUpdater.java

@@ -479,12 +479,13 @@ public class PhiUpdater {
             return;
         }
 
-        boolean exists = frontierBlock.getPhis().stream()
+        for (Phi phi : frontierBlock.getPhis()) {
-                .flatMap(phi -> phi.getIncomings().stream())
+            for (Incoming incoming : phi.getIncomings()) {
-                .anyMatch(incoming -> incoming.getSource() == block && incoming.getValue() == var);
+                if (incoming.getSource() == block && incoming.getValue() == var) {
-        if (exists) {
                     return;
                 }
+            }
+        }
 
         Phi phi = phiMap[frontier][var.getIndex()];
         if (phi == null) {

core/src/main/java/org/teavm/vm/TeaVM.java

@@ -977,7 +977,9 @@ public class TeaVM implements TeaVMHost, ServiceRepository {
 
         ListableClassReaderSourceAdapter(ClassReaderSource classSource, Set<String> classes) {
             this.classSource = classSource;
-            this.classes = Collections.unmodifiableSet(classes);
+            this.classes = Collections.unmodifiableSet(classes.stream()
+                    .filter(className -> classSource.get(className) != null)
+                    .collect(Collectors.toSet()));
         }
 
         @Override

interop/core/src/main/java/org/teavm/interop/NoGcRoot.java

@@ -0,0 +1,26 @@
+/*
+ *  Copyright 2019 Alexey Andreev.
+ *
+ *  Licensed under the Apache License, Version 2.0 (the "License");
+ *  you may not use this file except in compliance with the License.
+ *  You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *
+ *  Unless required by applicable law or agreed to in writing, software
+ *  distributed under the License is distributed on an "AS IS" BASIS,
+ *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ *  See the License for the specific language governing permissions and
+ *  limitations under the License.
+ */
+package org.teavm.interop;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+@Retention(RetentionPolicy.RUNTIME)
+@Target(ElementType.FIELD)
+public @interface NoGcRoot {
+}

platform/src/main/java/org/teavm/platform/plugin/MetadataProviderTransformer.java

@@ -18,6 +18,7 @@ package org.teavm.platform.plugin;
 import java.util.HashSet;
 import java.util.Set;
 import org.teavm.backend.javascript.spi.GeneratedBy;
+import org.teavm.interop.NoGcRoot;
 import org.teavm.interop.NoSideEffects;
 import org.teavm.model.AccessLevel;
 import org.teavm.model.AnnotationHolder;
@@ -56,6 +57,7 @@ class MetadataProviderTransformer implements ClassHolderTransformer {
         field.setType(method.getResultType());
         field.setLevel(AccessLevel.PRIVATE);
         field.getModifiers().add(ElementModifier.STATIC);
+        field.getAnnotations().add(new AnnotationHolder(NoGcRoot.class.getName()));
         cls.addField(field);
 
         MethodHolder createMethod = new MethodHolder(method.getName() + "$$create", method.getSignature());