Add emitter. Refactor metadata generator. Fix bugs in timezone

formatting and parsing

teavm-classlib/src/main/java/org/teavm/classlib/java/text/TDateFormat.java

@@ -230,8 +230,8 @@ public abstract class TDateFormat extends TFormat {
     public TDate parse(String string) throws TParseException {
         TParsePosition position = new TParsePosition(0);
         TDate date = parse(string, position);
-        if (position.getIndex() == 0) {
-            throw new TParseException("Unparseable date" + string, position.getErrorIndex());
+        if (position.getErrorIndex() > 0) {
+            throw new TParseException("Unparseable date: " + string, position.getErrorIndex());
         }
         return date;
     }

teavm-classlib/src/main/java/org/teavm/classlib/java/text/TDateFormatElement.java

@@ -400,6 +400,7 @@ abstract class TDateFormatElement {
             if (position.getIndex() + 1 < text.length()) {
 
             }
+            prepareTrie();
             TTimeZone tz = match(searchTrie, text, position);
             if (tz != null) {
                 date.setTimeZone(tz);
@@ -415,12 +416,11 @@ abstract class TDateFormatElement {
         }
 
         public TTimeZone match(TrieNode node, String text, TParsePosition position) {
-            prepareTrie();
             int start = position.getIndex();
             int index = start;
             int lastMatch = start;
             TTimeZone tz = null;
-            while (node.childNodes.length > 0) {
+            while (node.childNodes != null && node.childNodes.length > 0) {
                 if (node.tz != null) {
                     lastMatch = index;
                     tz = node.tz;
@@ -432,7 +432,11 @@ abstract class TDateFormatElement {
                 if (next < 0) {
                     return null;
                 }
-                node = node.childNodes[index];
+                node = node.childNodes[next];
+            }
+            if (node.tz != null) {
+                lastMatch = index;
+                tz = node.tz;
             }
             position.setIndex(lastMatch);
             return tz;
@@ -459,6 +463,7 @@ abstract class TDateFormatElement {
                 TTimeZone tz = TTimeZone.getTimeZone(tzId);
                 builder.add(tz.getID(), tz);
             }
+            idSearchTrie = builder.build();
         }
     }
 
@@ -485,6 +490,7 @@ abstract class TDateFormatElement {
             position.setErrorIndex(index);
             return;
         }
+        ++index;
 
         if (index + 2 > text.length() || !Character.isDigit(text.charAt(index)) ||
                 !Character.isDigit(text.charAt(index + 1))) {
@@ -511,10 +517,9 @@ abstract class TDateFormatElement {
         TrieNodeBuilder root = new TrieNodeBuilder();
 
         public void add(String text, TTimeZone tz) {
-            int index = 0;
             TrieNodeBuilder node = root;
-            while (index < text.length()) {
-                char c = Character.toLowerCase(text.charAt(index));
+            for (int i = 0; i < text.length(); ++i) {
+                char c = Character.toLowerCase(text.charAt(i));
                 while (node.ch != c) {
                     if (node.ch == '\0') {
                         node.ch = c;
@@ -537,12 +542,15 @@ abstract class TDateFormatElement {
 
         TrieNode build(TrieNodeBuilder builder) {
             TrieNode node = new TrieNode();
+            if (builder == null) {
+                return node;
+            }
             node.tz = builder.tz;
             List<TrieNodeBuilder> builders = new ArrayList<>();
             TrieNodeBuilder tmp = builder;
             while (tmp.ch != '\0') {
-                builders.add(builder);
-                builder = builder.sibling;
+                builders.add(tmp);
+                tmp = tmp.sibling;
             }
             Collections.sort(builders, new Comparator<TrieNodeBuilder>() {
                 @Override public int compare(TrieNodeBuilder o1, TrieNodeBuilder o2) {
@@ -553,7 +561,7 @@ abstract class TDateFormatElement {
             node.childNodes = new TrieNode[builders.size()];
             for (int i = 0; i < node.chars.length; ++i) {
                 node.chars[i] = builders.get(i).ch;
-                node.childNodes[i] = build(builders.get(i));
+                node.childNodes[i] = build(builders.get(i).next);
             }
             return node;
         }

teavm-core/src/main/java/org/teavm/model/MethodReference.java

@@ -139,6 +139,12 @@ public class MethodReference {
         return reprCache;
     }
 
+    public static MethodReference parse(String string) {
+        int index = string.lastIndexOf('.');
+        String className = string.substring(0, index);
+        return new MethodReference(className, MethodDescriptor.parse(string.substring(index + 1)));
+    }
+
     public String signatureToString() {
         StringBuilder sb = new StringBuilder();
         sb.append('(');

teavm-core/src/main/java/org/teavm/model/emit/ForkEmitter.java

@@ -0,0 +1,65 @@
+/*
+ *  Copyright 2015 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.model.emit;
+
+import org.teavm.model.BasicBlock;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public abstract class ForkEmitter {
+    public abstract void setThen(BasicBlock block);
+
+    public abstract void setElse(BasicBlock block);
+
+    public ForkEmitter and(BasicBlock block, final ForkEmitter other) {
+        setThen(block);
+        return new ForkEmitter() {
+            @Override public void setThen(BasicBlock block) {
+                other.setThen(block);
+            }
+            @Override public void setElse(BasicBlock block) {
+                ForkEmitter.this.setElse(block);
+                other.setElse(block);
+            }
+        };
+    }
+
+    public ForkEmitter or(BasicBlock block, final ForkEmitter other) {
+        setElse(block);
+        return new ForkEmitter() {
+            @Override public void setThen(BasicBlock block) {
+                ForkEmitter.this.setThen(block);
+                other.setThen(block);
+            }
+            @Override public void setElse(BasicBlock block) {
+                other.setElse(block);
+            }
+        };
+    }
+
+    public ForkEmitter not() {
+        return new ForkEmitter() {
+            @Override public void setThen(BasicBlock block) {
+                ForkEmitter.this.setElse(block);
+            }
+            @Override public void setElse(BasicBlock block) {
+                ForkEmitter.this.setThen(block);
+            }
+        };
+    }
+}

teavm-core/src/main/java/org/teavm/model/emit/ProgramEmitter.java

@@ -0,0 +1,217 @@
+/*
+ *  Copyright 2015 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.model.emit;
+
+import org.teavm.model.*;
+import org.teavm.model.instructions.ConstructInstruction;
+import org.teavm.model.instructions.DoubleConstantInstruction;
+import org.teavm.model.instructions.ExitInstruction;
+import org.teavm.model.instructions.FloatConstantInstruction;
+import org.teavm.model.instructions.GetFieldInstruction;
+import org.teavm.model.instructions.IntegerConstantInstruction;
+import org.teavm.model.instructions.InvocationType;
+import org.teavm.model.instructions.InvokeInstruction;
+import org.teavm.model.instructions.JumpInstruction;
+import org.teavm.model.instructions.LongConstantInstruction;
+import org.teavm.model.instructions.NullConstantInstruction;
+import org.teavm.model.instructions.PutFieldInstruction;
+import org.teavm.model.instructions.StringConstantInstruction;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public final class ProgramEmitter {
+    private Program program;
+    private BasicBlock block;
+    private InstructionLocation currentLocation;
+
+    private ProgramEmitter(Program program, BasicBlock block) {
+        this.program = program;
+        this.block = block;
+    }
+
+    public Program getProgram() {
+        return program;
+    }
+
+    public BasicBlock getBlock() {
+        return block;
+    }
+
+    public void setBlock(BasicBlock block) {
+        this.block = block;
+    }
+
+    public BasicBlock createBlock() {
+        BasicBlock block = program.createBasicBlock();
+        setBlock(block);
+        return block;
+    }
+
+    public ValueEmitter constant(String value) {
+        Variable var = program.createVariable();
+        StringConstantInstruction insn = new StringConstantInstruction();
+        insn.setReceiver(var);
+        insn.setConstant(value);
+        addInstruction(insn);
+        return wrap(var);
+    }
+
+    public ValueEmitter constant(int value) {
+        Variable var = program.createVariable();
+        IntegerConstantInstruction insn = new IntegerConstantInstruction();
+        insn.setReceiver(var);
+        insn.setConstant(value);
+        addInstruction(insn);
+        return wrap(var);
+    }
+
+    public ValueEmitter constant(long value) {
+        Variable var = program.createVariable();
+        LongConstantInstruction insn = new LongConstantInstruction();
+        insn.setReceiver(var);
+        insn.setConstant(value);
+        addInstruction(insn);
+        return wrap(var);
+    }
+
+    public ValueEmitter constant(float value) {
+        Variable var = program.createVariable();
+        FloatConstantInstruction insn = new FloatConstantInstruction();
+        insn.setReceiver(var);
+        insn.setConstant(value);
+        addInstruction(insn);
+        return wrap(var);
+    }
+
+    public ValueEmitter constant(double value) {
+        Variable var = program.createVariable();
+        DoubleConstantInstruction insn = new DoubleConstantInstruction();
+        insn.setReceiver(var);
+        insn.setConstant(value);
+        addInstruction(insn);
+        return wrap(var);
+    }
+
+    public ValueEmitter constantNull() {
+        Variable var = program.createVariable();
+        NullConstantInstruction insn = new NullConstantInstruction();
+        insn.setReceiver(var);
+        addInstruction(insn);
+        return wrap(var);
+    }
+
+    public ValueEmitter getField(FieldReference field, ValueType type) {
+        Variable var = program.createVariable();
+        GetFieldInstruction insn = new GetFieldInstruction();
+        insn.setField(field);
+        insn.setFieldType(type);
+        insn.setReceiver(var);
+        addInstruction(insn);
+        return wrap(var);
+    }
+
+    public ProgramEmitter setField(FieldReference field, ValueType type, ValueEmitter value) {
+        PutFieldInstruction insn = new PutFieldInstruction();
+        insn.setField(field);
+        insn.setFieldType(type);
+        insn.setValue(value.getVariable());
+        addInstruction(insn);
+        return this;
+    }
+
+    public ValueEmitter invoke(MethodReference method, ValueEmitter... arguments) {
+        Variable result = null;
+        if (method.getReturnType() != ValueType.VOID) {
+            result = program.createVariable();
+        }
+        InvokeInstruction insn = new InvokeInstruction();
+        insn.setType(InvocationType.SPECIAL);
+        insn.setMethod(method);
+        insn.setReceiver(result);
+        for (ValueEmitter arg : arguments) {
+            insn.getArguments().add(arg.variable);
+        }
+        addInstruction(insn);
+        return result != null ? wrap(result) : null;
+    }
+
+    public ProgramEmitter invokeAndIgnore(MethodReference method, ValueEmitter... arguments) {
+        invoke(method, arguments);
+        return this;
+    }
+
+    public ValueEmitter construct(MethodReference method, ValueEmitter... arguments) {
+        Variable var = program.createVariable();
+        ConstructInstruction insn = new ConstructInstruction();
+        insn.setReceiver(var);
+        insn.setType(method.getClassName());
+        addInstruction(insn);
+        ValueEmitter instance = wrap(var);
+        instance.invokeSpecial(method, arguments);
+        return instance;
+    }
+
+    public ProgramEmitter jump(BasicBlock block) {
+        JumpInstruction insn = new JumpInstruction();
+        insn.setTarget(block);
+        addInstruction(insn);
+        this.block = block;
+        return this;
+    }
+
+    public void exit() {
+        ExitInstruction insn = new ExitInstruction();
+        addInstruction(insn);
+    }
+
+    public ValueEmitter wrap(Variable var) {
+        return new ValueEmitter(this, block, var);
+    }
+
+    public ValueEmitter wrapNew() {
+        return wrap(program.createVariable());
+    }
+
+    public InstructionLocation getCurrentLocation() {
+        return currentLocation;
+    }
+
+    public void setCurrentLocation(InstructionLocation currentLocation) {
+        this.currentLocation = currentLocation;
+    }
+
+    public void addInstruction(Instruction insn) {
+        if (currentLocation != null) {
+            insn.setLocation(currentLocation);
+        }
+        block.getInstructions().add(insn);
+    }
+
+    public static ProgramEmitter create(MethodHolder method) {
+        Program program = new Program();
+        method.setProgram(program);
+        BasicBlock zeroBlock = program.createBasicBlock();
+        BasicBlock block = program.createBasicBlock();
+
+        JumpInstruction insn = new JumpInstruction();
+        insn.setTarget(block);
+        zeroBlock.getInstructions().add(insn);
+
+        return new ProgramEmitter(program, block);
+    }
+}

teavm-core/src/main/java/org/teavm/model/emit/ValueEmitter.java

@@ -0,0 +1,280 @@
+/*
+ *  Copyright 2015 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.model.emit;
+
+import org.teavm.model.BasicBlock;
+import org.teavm.model.FieldReference;
+import org.teavm.model.Incoming;
+import org.teavm.model.MethodReference;
+import org.teavm.model.Phi;
+import org.teavm.model.ValueType;
+import org.teavm.model.Variable;
+import org.teavm.model.instructions.ArrayLengthInstruction;
+import org.teavm.model.instructions.BinaryBranchingCondition;
+import org.teavm.model.instructions.BinaryBranchingInstruction;
+import org.teavm.model.instructions.BinaryInstruction;
+import org.teavm.model.instructions.BinaryOperation;
+import org.teavm.model.instructions.BranchingCondition;
+import org.teavm.model.instructions.BranchingInstruction;
+import org.teavm.model.instructions.CastInstruction;
+import org.teavm.model.instructions.CastIntegerDirection;
+import org.teavm.model.instructions.CastIntegerInstruction;
+import org.teavm.model.instructions.CastNumberInstruction;
+import org.teavm.model.instructions.ExitInstruction;
+import org.teavm.model.instructions.GetElementInstruction;
+import org.teavm.model.instructions.GetFieldInstruction;
+import org.teavm.model.instructions.IntegerSubtype;
+import org.teavm.model.instructions.InvocationType;
+import org.teavm.model.instructions.InvokeInstruction;
+import org.teavm.model.instructions.IsInstanceInstruction;
+import org.teavm.model.instructions.NegateInstruction;
+import org.teavm.model.instructions.NumericOperandType;
+import org.teavm.model.instructions.PutFieldInstruction;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+public class ValueEmitter {
+    ProgramEmitter pe;
+    BasicBlock block;
+    Variable variable;
+
+    ValueEmitter(ProgramEmitter programEmitter, BasicBlock block, Variable variable) {
+        this.pe = programEmitter;
+        this.block = block;
+        this.variable = variable;
+    }
+
+    public ProgramEmitter getProgramEmitter() {
+        return pe;
+    }
+
+    public BasicBlock getBlock() {
+        return block;
+    }
+
+    public Variable getVariable() {
+        return variable;
+    }
+
+    public ValueEmitter getField(FieldReference field, ValueType type) {
+        Variable var = pe.getProgram().createVariable();
+        GetFieldInstruction insn = new GetFieldInstruction();
+        insn.setField(field);
+        insn.setFieldType(type);
+        insn.setReceiver(var);
+        insn.setInstance(variable);
+        pe.addInstruction(insn);
+        return pe.wrap(var);
+    }
+
+    public void setField(FieldReference field, ValueType type, ValueEmitter value) {
+        PutFieldInstruction insn = new PutFieldInstruction();
+        insn.setField(field);
+        insn.setFieldType(type);
+        insn.setInstance(variable);
+        insn.setValue(value.getVariable());
+        pe.addInstruction(insn);
+    }
+
+    public ValueEmitter binary(BinaryOperation op, NumericOperandType type, ValueEmitter other) {
+        Variable var = pe.getProgram().createVariable();
+        BinaryInstruction insn = new BinaryInstruction(op, type);
+        insn.setFirstOperand(variable);
+        insn.setSecondOperand(other.variable);
+        insn.setReceiver(var);
+        pe.addInstruction(insn);
+        return pe.wrap(var);
+    }
+
+    public ValueEmitter add(NumericOperandType type, ValueEmitter other) {
+        return binary(BinaryOperation.ADD, type, other);
+    }
+
+    public ValueEmitter iadd(ValueEmitter other) {
+        return add(NumericOperandType.INT, other);
+    }
+
+    public ValueEmitter sub(NumericOperandType type, ValueEmitter other) {
+        return binary(BinaryOperation.SUBTRACT, type, other);
+    }
+
+    public ValueEmitter isub(ValueEmitter other) {
+        return sub(NumericOperandType.INT, other);
+    }
+
+    public ValueEmitter compare(NumericOperandType type, ValueEmitter other) {
+        return binary(BinaryOperation.COMPARE, type, other);
+    }
+
+    public ValueEmitter icompare(ValueEmitter other) {
+        return compare(NumericOperandType.INT, other);
+    }
+
+    public ValueEmitter neg(NumericOperandType type) {
+        Variable var = pe.getProgram().createVariable();
+        NegateInstruction insn = new NegateInstruction(type);
+        insn.setOperand(variable);
+        insn.setReceiver(var);
+        return pe.wrap(var);
+    }
+
+    public ValueEmitter ineg() {
+        return neg(NumericOperandType.INT);
+    }
+
+    public ValueEmitter invoke(InvocationType type, MethodReference method, ValueEmitter... arguments) {
+        Variable result = null;
+        if (method.getReturnType() != ValueType.VOID) {
+            result = pe.getProgram().createVariable();
+        }
+        InvokeInstruction insn = new InvokeInstruction();
+        insn.setType(type);
+        insn.setMethod(method);
+        insn.setInstance(variable);
+        insn.setReceiver(result);
+        for (ValueEmitter arg : arguments) {
+            insn.getArguments().add(arg.variable);
+        }
+        pe.addInstruction(insn);
+        return result != null ? pe.wrap(result) : null;
+    }
+
+    public ValueEmitter invokeSpecial(MethodReference method, ValueEmitter... arguments) {
+        return invoke(InvocationType.SPECIAL, method, arguments);
+    }
+
+    public ValueEmitter invokeVirtual(MethodReference method, ValueEmitter... arguments) {
+        return invoke(InvocationType.VIRTUAL, method, arguments);
+    }
+
+    public ValueEmitter join(ValueEmitter other) {
+        Variable var = pe.getProgram().createVariable();
+        Phi phi = new Phi();
+        phi.setReceiver(var);
+        Incoming incoming = new Incoming();
+        incoming.setSource(block);
+        incoming.setValue(variable);
+        phi.getIncomings().add(incoming);
+        incoming = new Incoming();
+        incoming.setSource(other.block);
+        incoming.setValue(other.variable);
+        phi.getIncomings().add(incoming);
+        pe.getBlock().getPhis().add(phi);
+        return new ValueEmitter(pe, pe.getBlock(), var);
+    }
+
+    public ForkEmitter fork(BinaryBranchingCondition condition, ValueEmitter other) {
+        final BinaryBranchingInstruction insn = new BinaryBranchingInstruction(condition);
+        insn.setFirstOperand(variable);
+        insn.setSecondOperand(other.variable);
+        pe.addInstruction(insn);
+        return new ForkEmitter() {
+            @Override public void setThen(BasicBlock block) {
+                insn.setConsequent(block);
+            }
+            @Override public void setElse(BasicBlock block) {
+                insn.setAlternative(block);
+            }
+        };
+    }
+
+    public ForkEmitter fork(BranchingCondition condition) {
+        final BranchingInstruction insn = new BranchingInstruction(condition);
+        insn.setOperand(variable);
+        pe.addInstruction(insn);
+        return new ForkEmitter() {
+            @Override public void setThen(BasicBlock block) {
+                insn.setConsequent(block);
+            }
+            @Override public void setElse(BasicBlock block) {
+                insn.setAlternative(block);
+            }
+        };
+    }
+
+    public void returnValue() {
+        ExitInstruction insn = new ExitInstruction();
+        insn.setValueToReturn(variable);
+        pe.addInstruction(insn);
+    }
+
+    public ValueEmitter cast(ValueType type) {
+        Variable result = pe.getProgram().createVariable();
+        CastInstruction insn = new CastInstruction();
+        insn.setValue(variable);
+        insn.setReceiver(result);
+        insn.setTargetType(type);
+        pe.addInstruction(insn);
+        return pe.wrap(result);
+    }
+
+    public ValueEmitter cast(NumericOperandType from, NumericOperandType to) {
+        Variable result = pe.getProgram().createVariable();
+        CastNumberInstruction insn = new CastNumberInstruction(from, to);
+        insn.setValue(variable);
+        insn.setReceiver(result);
+        pe.addInstruction(insn);
+        return pe.wrap(result);
+    }
+
+    public ValueEmitter cast(IntegerSubtype subtype, CastIntegerDirection dir) {
+        Variable result = pe.getProgram().createVariable();
+        CastIntegerInstruction insn = new CastIntegerInstruction(subtype, dir);
+        insn.setValue(variable);
+        insn.setReceiver(result);
+        pe.addInstruction(insn);
+        return pe.wrap(result);
+    }
+
+    public ValueEmitter toInteger(IntegerSubtype from) {
+        return cast(from, CastIntegerDirection.TO_INTEGER);
+    }
+
+    public ValueEmitter fromInteger(IntegerSubtype to) {
+        return cast(to, CastIntegerDirection.FROM_INTEGER);
+    }
+
+    public ValueEmitter getElement(ValueEmitter index) {
+        Variable result = pe.getProgram().createVariable();
+        GetElementInstruction insn = new GetElementInstruction();
+        insn.setArray(variable);
+        insn.setIndex(index.variable);
+        insn.setReceiver(variable);
+        pe.addInstruction(insn);
+        return pe.wrap(result);
+    }
+
+    public ValueEmitter arrayLength() {
+        Variable result = pe.getProgram().createVariable();
+        ArrayLengthInstruction insn = new ArrayLengthInstruction();
+        insn.setArray(variable);
+        insn.setReceiver(result);
+        pe.addInstruction(insn);
+        return pe.wrap(result);
+    }
+
+    public ValueEmitter instanceOf(ValueType type) {
+        Variable result = pe.getProgram().createVariable();
+        IsInstanceInstruction insn = new IsInstanceInstruction();
+        insn.setValue(variable);
+        insn.setReceiver(result);
+        insn.setType(type);
+        pe.addInstruction(insn);
+        return pe.wrap(result);
+    }
+}

teavm-platform/src/main/java/org/teavm/platform/plugin/MetadataProviderNativeGenerator.java

@@ -33,18 +33,12 @@ import org.teavm.platform.metadata.Resource;
 public class MetadataProviderNativeGenerator implements Generator {
     @Override
     public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
-        // Validate method
         ClassReader cls = context.getClassSource().get(methodRef.getClassName());
         MethodReader method = cls.getMethod(methodRef.getDescriptor());
         AnnotationReader providerAnnot = method.getAnnotations().get(MetadataProvider.class.getName());
-        if (providerAnnot == null) {
-            return;
-        }
-        if (!method.hasModifier(ElementModifier.NATIVE)) {
-            context.getDiagnostics().error(new CallLocation(methodRef), "Method {{m0}} is marked with " +
-                    "{{c1}} annotation, but it is not native", methodRef, MetadataProvider.class.getName());
-            return;
-        }
+
+        AnnotationReader refAnnot = method.getAnnotations().get(MetadataProviderRef.class.getName());
+        methodRef = MethodReference.parse(refAnnot.getValue("value").getString());
 
         // Find and instantiate metadata generator
         ValueType generatorType = providerAnnot.getValue("value").getJavaClass();
@@ -78,12 +72,8 @@ public class MetadataProviderNativeGenerator implements Generator {
 
         // Generate resource loader
         Resource resource = generator.generateMetadata(metadataContext, methodRef);
-        writer.append("if (!window.hasOwnProperty(\"").appendMethodBody(methodRef).append("$$resource\")) {")
-                .indent().softNewLine();
-        writer.append("window.").appendMethodBody(methodRef).append("$$resource = ");
+        writer.append("return ");
         ResourceWriterHelper.write(writer, resource);
         writer.append(';').softNewLine();
-        writer.outdent().append('}').softNewLine();
-        writer.append("return ").appendMethodBody(methodRef).append("$$resource;").softNewLine();
     }
 }

teavm-platform/src/main/java/org/teavm/platform/plugin/MetadataProviderRef.java

@@ -0,0 +1,31 @@
+/*
+ *  Copyright 2015 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 java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ *
+ * @author Alexey Andreev
+ */
+@Retention(RetentionPolicy.CLASS)
+@Target(ElementType.METHOD)
+@interface MetadataProviderRef {
+    String value();
+}

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

@@ -18,6 +18,10 @@ package org.teavm.platform.plugin;
 import org.teavm.diagnostics.Diagnostics;
 import org.teavm.javascript.spi.GeneratedBy;
 import org.teavm.model.*;
+import org.teavm.model.emit.ForkEmitter;
+import org.teavm.model.emit.ProgramEmitter;
+import org.teavm.model.instructions.BinaryBranchingCondition;
+import org.teavm.model.util.ModelUtils;
 import org.teavm.platform.PlatformClass;
 import org.teavm.platform.metadata.ClassScopedMetadataProvider;
 import org.teavm.platform.metadata.MetadataProvider;
@@ -27,15 +31,14 @@ import org.teavm.platform.metadata.MetadataProvider;
  * @author Alexey Andreev
  */
 class MetadataProviderTransformer implements ClassHolderTransformer {
+    static int fieldIdGen;
+
     @Override
     public void transformClass(ClassHolder cls, ClassReaderSource innerSource, Diagnostics diagnostics) {
-        for (MethodHolder method : cls.getMethods()) {
+        for (MethodHolder method : cls.getMethods().toArray(new MethodHolder[0])) {
             AnnotationReader providerAnnot = method.getAnnotations().get(MetadataProvider.class.getName());
             if (providerAnnot != null) {
-                AnnotationHolder genAnnot = new AnnotationHolder(GeneratedBy.class.getName());
-                genAnnot.getValues().put("value", new AnnotationValue(ValueType.object(
-                        MetadataProviderNativeGenerator.class.getName())));
-                method.getAnnotations().add(genAnnot);
+                transformMetadataMethod(cls, method, diagnostics);
             }
             providerAnnot = method.getAnnotations().get(ClassScopedMetadataProvider.class.getName());
             if (providerAnnot != null) {
@@ -53,4 +56,58 @@ class MetadataProviderTransformer implements ClassHolderTransformer {
             }
         }
     }
+
+    private void transformMetadataMethod(ClassHolder cls, MethodHolder method, Diagnostics diagnostics) {
+        if (!validate(method, diagnostics)) {
+            return;
+        }
+
+        FieldHolder field = new FieldHolder("$$metadata$$" + fieldIdGen++);
+        field.setType(method.getResultType());
+        field.setLevel(AccessLevel.PRIVATE);
+        field.getModifiers().add(ElementModifier.STATIC);
+        cls.addField(field);
+
+        MethodHolder createMethod = new MethodHolder(method.getName() + "$$create", method.getSignature());
+        createMethod.setLevel(AccessLevel.PRIVATE);
+        createMethod.getModifiers().add(ElementModifier.NATIVE);
+        createMethod.getModifiers().add(ElementModifier.STATIC);
+        cls.addMethod(createMethod);
+        AnnotationHolder genAnnot = new AnnotationHolder(GeneratedBy.class.getName());
+        genAnnot.getValues().put("value", new AnnotationValue(ValueType.object(
+                MetadataProviderNativeGenerator.class.getName())));
+        createMethod.getAnnotations().add(genAnnot);
+        ModelUtils.copyAnnotations(method.getAnnotations(), createMethod.getAnnotations());
+
+        AnnotationHolder refAnnot = new AnnotationHolder(MetadataProviderRef.class.getName());
+        refAnnot.getValues().put("value", new AnnotationValue(method.getReference().toString()));
+        createMethod.getAnnotations().add(refAnnot);
+
+        method.getModifiers().remove(ElementModifier.NATIVE);
+        ProgramEmitter pe = ProgramEmitter.create(method);
+        ForkEmitter fork = pe.getField(field.getReference(), field.getType()).fork(
+                BinaryBranchingCondition.REFERENCE_NOT_EQUAL, pe.constantNull());
+
+        BasicBlock resourceFound = pe.createBlock();
+        fork.setThen(resourceFound);
+        pe.getField(field.getReference(), field.getType()).returnValue();
+
+        fork.setElse(pe.createBlock());
+        pe.setField(field.getReference(), field.getType(), pe.invoke(createMethod.getReference()));
+        pe.jump(resourceFound);
+    }
+
+    private boolean validate(MethodHolder method, Diagnostics diagnostics) {
+        AnnotationReader providerAnnot = method.getAnnotations().get(MetadataProvider.class.getName());
+        if (providerAnnot == null) {
+            return false;
+        }
+        if (!method.hasModifier(ElementModifier.NATIVE)) {
+            diagnostics.error(new CallLocation(method.getReference()), "Method {{m0}} is marked with " +
+                    "{{c1}} annotation, but it is not native", method.getReference(),
+                    MetadataProvider.class.getName());
+            return false;
+        }
+        return true;
+    }
 }