C: fix support for resources

core/src/main/resources/org/teavm/backend/c/resource.c

@@ -29,7 +29,7 @@ TeaVM_Array* teavm_resourceMapKeys(TeaVM_ResourceMap *map) {
     void** data = TEAVM_ARRAY_DATA(array, void*);
     for (int32_t i = 0; i < map->size; ++i) {
         if (map->entries[i].key != NULL) {
-            data[index++] = map->entries[i].key;
+            data[index++] = *map->entries[i].key;
         }
     }
 

core/src/main/resources/org/teavm/backend/c/string.c

@@ -19,6 +19,10 @@ int32_t teavm_hashCode(TeaVM_String* string) {
 }
 
 int32_t teavm_equals(TeaVM_String* first, TeaVM_String* second) {
+    if (first == second) {
+        return 1;
+    }
+
     if (first->characters->size != second->characters->size) {
         return 0;
     }

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

@@ -204,7 +204,7 @@ class MetadataCIntrinsic implements Generator {
                 int hashCode = key.hashCode();
                 int collisionRatio = 0;
                 while (true) {
-                    int index = mod(hashCode++, table.length);
+                    int index = Integer.remainderUnsigned(hashCode++, table.length);
                     if (table[index] == null) {
                         table[index] = key;
                         break;
@@ -249,14 +249,6 @@ class MetadataCIntrinsic implements Generator {
         context.writerBefore().outdent().print("}");
     }
 
-    private static int mod(int a, int b) {
-        a %= b;
-        if (a < 0) {
-            a += b;
-        }
-        return a;
-    }
-
     class MethodGenerator {
         private MethodReference targetMethod;
         private MetadataGenerator generator;

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

@@ -95,6 +95,7 @@ public class PlatformPlugin implements TeaVMPlugin, MetadataRegistration {
 
             TeaVMCHost cHost = host.getExtension(TeaVMCHost.class);
             if (cHost != null) {
+                host.add(new ResourceCTransformer());
                 MetadataCIntrinsic metadataCIntrinsic = new MetadataCIntrinsic();
                 cHost.addGenerator(ctx -> {
                     metadataCIntrinsic.init(ctx.getClassSource(), ctx.getClassLoader(),

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

@@ -0,0 +1,34 @@
+/*
+ *  Copyright 2014 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.platform.plugin;
+
+import org.teavm.model.ClassHolder;
+import org.teavm.model.ClassHolderTransformer;
+import org.teavm.model.ClassHolderTransformerContext;
+import org.teavm.model.MethodHolder;
+import org.teavm.model.Program;
+
+class ResourceCTransformer implements ClassHolderTransformer {
+    @Override
+    public void transformClass(ClassHolder cls, ClassHolderTransformerContext context) {
+        for (MethodHolder method : cls.getMethods()) {
+            Program program = method.getProgram();
+            if (program != null) {
+                new ResourceProgramTransformer(context.getHierarchy(), program).removeCasts();
+            }
+        }
+    }
+}

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

@@ -61,18 +61,31 @@ class ResourceProgramTransformer {
                     insn.delete();
                 }
             } else if (insn instanceof CastInstruction) {
-                CastInstruction cast = (CastInstruction) insn;
+                removeCastToResource((CastInstruction) insn);
-                if (hierarchy.isSuperType(RESOURCE, cast.getTargetType(), false)) {
+            }
-                    AssignInstruction assign = new AssignInstruction();
+        }
-                    assign.setReceiver(cast.getReceiver());
+    }
-                    assign.setAssignee(cast.getValue());
+
-                    assign.setLocation(cast.getLocation());
+    void removeCasts() {
-                    insn.replace(assign);
+        for (BasicBlock block : program.getBasicBlocks()) {
+            for (Instruction insn : block) {
+                if (insn instanceof CastInstruction) {
+                    removeCastToResource((CastInstruction) insn);
                 }
             }
         }
     }
 
+    private void removeCastToResource(CastInstruction cast) {
+        if (hierarchy.isSuperType(RESOURCE, cast.getTargetType(), false)) {
+            AssignInstruction assign = new AssignInstruction();
+            assign.setReceiver(cast.getReceiver());
+            assign.setAssignee(cast.getValue());
+            assign.setLocation(cast.getLocation());
+            cast.replace(assign);
+        }
+    }
+
     private List<Instruction> transformInvoke(InvokeInstruction insn) {
         if (insn.getType() != InvocationType.VIRTUAL) {
             return null;