JS: get rid of IOException in SourceWriter and related classes

classlib/src/main/java/org/teavm/classlib/impl/ServiceLoaderJSSupport.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.classlib.impl;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -27,7 +26,7 @@ public class ServiceLoaderJSSupport implements Generator {
     private static final MethodDescriptor INIT_METHOD = new MethodDescriptor("<init>", void.class);
 
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         var templateFactory = new JavaScriptTemplateFactory(context.getClassLoader(), context.getClassSource());
         var template = templateFactory.createFromResource("org/teavm/classlib/java/util/ServiceLoader.js");
         var information = context.getService(ServiceLoaderInformation.class);

classlib/src/main/java/org/teavm/classlib/impl/reflection/ConverterInjector.java

@@ -15,14 +15,13 @@
  */
 package org.teavm.classlib.impl.reflection;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.spi.Injector;
 import org.teavm.backend.javascript.spi.InjectorContext;
 import org.teavm.model.MethodReference;
 
 public class ConverterInjector implements Injector {
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "toJava":
             case "fromJava":

classlib/src/main/java/org/teavm/classlib/impl/string/JSStringConstructorGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.classlib.impl.string;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -23,7 +22,7 @@ import org.teavm.model.MethodReference;
 
 public class JSStringConstructorGenerator implements Generator {
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         writer.append(context.getParameterName(0));
         writer.append(".").appendField(JSStringInjector.NATIVE_FIELD).ws().append("=").ws();
         writer.append(context.getParameterName(1)).append(";").softNewLine();

classlib/src/main/java/org/teavm/classlib/impl/string/JSStringInjector.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.classlib.impl.string;
 
-import java.io.IOException;
 import java.util.function.Function;
 import org.teavm.backend.javascript.ProviderContext;
 import org.teavm.backend.javascript.spi.Injector;
@@ -51,7 +50,7 @@ public class JSStringInjector implements Injector, Function<ProviderContext, Inj
     }
 
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "initWithEmptyChars":
                 initWithEmptyChars(context);
@@ -104,13 +103,13 @@ public class JSStringInjector implements Injector, Function<ProviderContext, Inj
         }
     }
 
-    private void initWithEmptyChars(InjectorContext context) throws IOException {
+    private void initWithEmptyChars(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".").appendField(NATIVE_FIELD).ws().append("=").ws().append("\"\"");
     }
 
-    private void borrowChars(InjectorContext context) throws IOException {
+    private void borrowChars(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".").appendField(NATIVE_FIELD).ws().append("=").ws();
@@ -118,7 +117,7 @@ public class JSStringInjector implements Injector, Function<ProviderContext, Inj
         writer.append(".").appendField(NATIVE_FIELD);
     }
 
-    private void initWithCharArray(InjectorContext context) throws IOException {
+    private void initWithCharArray(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".").appendField(NATIVE_FIELD).ws().append("=").ws();
@@ -131,7 +130,7 @@ public class JSStringInjector implements Injector, Function<ProviderContext, Inj
         writer.append(")");
     }
 
-    private void takeCharArray(InjectorContext context) throws IOException {
+    private void takeCharArray(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".").appendField(NATIVE_FIELD).ws().append("=").ws();
@@ -140,13 +139,13 @@ public class JSStringInjector implements Injector, Function<ProviderContext, Inj
         writer.append(".data)");
     }
 
-    private void charactersLength(InjectorContext context) throws IOException {
+    private void charactersLength(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".").appendField(NATIVE_FIELD).append(".length");
     }
 
-    private void charactersGet(InjectorContext context) throws IOException {
+    private void charactersGet(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".").appendField(NATIVE_FIELD).append(".charCodeAt(");
@@ -154,7 +153,7 @@ public class JSStringInjector implements Injector, Function<ProviderContext, Inj
         writer.append(")");
     }
 
-    private void copyCharsToArray(InjectorContext context) throws IOException {
+    private void copyCharsToArray(InjectorContext context) {
         var writer = context.getWriter();
         writer.appendFunction("$rt_stringToCharArray").append("(");
         context.writeExpr(context.getArgument(0));
@@ -171,7 +170,7 @@ public class JSStringInjector implements Injector, Function<ProviderContext, Inj
         writer.append(")");
     }
 
-    private void substringJS(InjectorContext context) throws IOException {
+    private void substringJS(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".substring(");
@@ -181,7 +180,7 @@ public class JSStringInjector implements Injector, Function<ProviderContext, Inj
         writer.append(")");
     }
 
-    private void fastCharArray(InjectorContext context) throws IOException {
+    private void fastCharArray(InjectorContext context) {
         var writer = context.getWriter();
         writer.appendFunction("$rt_fastStringToCharArray").append("(");
         context.writeExpr(context.getArgument(0));
@@ -189,44 +188,44 @@ public class JSStringInjector implements Injector, Function<ProviderContext, Inj
         writer.append(")");
     }
 
-    private void nativeString(InjectorContext context) throws IOException {
+    private void nativeString(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".").appendField(NATIVE_FIELD);
     }
 
-    private void toLowerCaseJS(InjectorContext context) throws IOException {
+    private void toLowerCaseJS(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".toLowerCase()");
     }
 
-    private void toUpperCaseJS(InjectorContext context) throws IOException {
+    private void toUpperCaseJS(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".toUpperCase()");
     }
 
-    private void intern(InjectorContext context) throws IOException {
+    private void intern(InjectorContext context) {
         var writer = context.getWriter();
         writer.appendFunction("$rt_intern").append("(");
         context.writeExpr(context.getArgument(0));
         writer.append(")");
     }
 
-    private void stripJS(InjectorContext context) throws IOException {
+    private void stripJS(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".trim()");
     }
 
-    private void stripLeadingJS(InjectorContext context) throws IOException {
+    private void stripLeadingJS(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".trimStart()");
     }
 
-    private void stripTrailingJS(InjectorContext context) throws IOException {
+    private void stripTrailingJS(InjectorContext context) {
         var writer = context.getWriter();
         context.writeExpr(context.getArgument(0));
         writer.append(".trimEnd()");

classlib/src/main/java/org/teavm/classlib/java/lang/ClassGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.classlib.java.lang;
 
-import java.io.IOException;
 import java.util.Set;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.rendering.Precedence;
@@ -43,7 +42,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
             new FieldReference(Class.class.getName(), "platformClass");
 
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "createMetadata":
                 generateCreateMetadata(context, writer);
@@ -52,7 +51,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
     }
 
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "newEmptyInstance":
                 context.getWriter().append("new").ws().append("(");
@@ -133,7 +132,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
         });
     }
 
-    private void generateCreateMetadata(GeneratorContext context, SourceWriter writer) throws IOException {
+    private void generateCreateMetadata(GeneratorContext context, SourceWriter writer) {
         ReflectionDependencyListener reflection = context.getService(ReflectionDependencyListener.class);
         for (String className : reflection.getClassesWithReflectableFields()) {
             generateCreateFieldsForClass(context, writer, className);
@@ -143,8 +142,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
         }
     }
 
-    private void generateCreateFieldsForClass(GeneratorContext context, SourceWriter writer, String className)
+    private void generateCreateFieldsForClass(GeneratorContext context, SourceWriter writer, String className) {
-            throws IOException {
         ReflectionDependencyListener reflection = context.getService(ReflectionDependencyListener.class);
         Set<String> accessibleFields = reflection.getAccessibleFields(className);
 
@@ -178,8 +176,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
         writer.outdent().append("];").softNewLine();
     }
 
-    private void generateCreateMethodsForClass(GeneratorContext context, SourceWriter writer, String className)
+    private void generateCreateMethodsForClass(GeneratorContext context, SourceWriter writer, String className) {
-            throws IOException {
         ReflectionDependencyListener reflection = context.getService(ReflectionDependencyListener.class);
         Set<MethodDescriptor> accessibleMethods = reflection.getAccessibleMethods(className);
 
@@ -219,7 +216,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
     }
 
     private <T extends MemberReader> void generateCreateMembers(SourceWriter writer, Iterable<T> members,
-            MemberRenderer<T> renderer) throws IOException {
+            MemberRenderer<T> renderer) {
         boolean first = true;
         for (T member : members) {
             if (!first) {
@@ -240,7 +237,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
         }
     }
 
-    private void appendProperty(SourceWriter writer, String name, boolean first, Fragment value) throws IOException {
+    private void appendProperty(SourceWriter writer, String name, boolean first, Fragment value) {
         if (!first) {
             writer.append(",").softNewLine();
         }
@@ -248,7 +245,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
         value.render();
     }
 
-    private void renderGetter(GeneratorContext context, SourceWriter writer, FieldReader field) throws IOException {
+    private void renderGetter(GeneratorContext context, SourceWriter writer, FieldReader field) {
         writer.append("function(obj)").ws().append("{").indent().softNewLine();
         initClass(context, writer, field);
         writer.append("return ");
@@ -257,7 +254,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
         writer.outdent().append("}");
     }
 
-    private void renderSetter(GeneratorContext context, SourceWriter writer, FieldReader field) throws IOException {
+    private void renderSetter(GeneratorContext context, SourceWriter writer, FieldReader field) {
         writer.append("function(obj,").ws().append("val)").ws().append("{").indent().softNewLine();
         initClass(context, writer, field);
         fieldAccess(writer, field);
@@ -267,7 +264,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
         writer.outdent().append("}");
     }
 
-    private void renderCallable(GeneratorContext context, SourceWriter writer, MethodReader method) throws IOException {
+    private void renderCallable(GeneratorContext context, SourceWriter writer, MethodReader method) {
         writer.append("function(obj,").ws().append("args)").ws().append("{").indent().softNewLine();
 
         initClass(context, writer, method);
@@ -299,13 +296,13 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
         writer.outdent().append("}");
     }
 
-    private void initClass(GeneratorContext context, SourceWriter writer, MemberReader member) throws IOException {
+    private void initClass(GeneratorContext context, SourceWriter writer, MemberReader member) {
         if (member.hasModifier(ElementModifier.STATIC) && context.isDynamicInitializer(member.getOwnerName())) {
             writer.appendClassInit(member.getOwnerName()).append("();").softNewLine();
         }
     }
 
-    private void fieldAccess(SourceWriter writer, FieldReader field) throws IOException {
+    private void fieldAccess(SourceWriter writer, FieldReader field) {
         if (field.hasModifier(ElementModifier.STATIC)) {
             writer.appendStaticField(field.getReference());
         } else {
@@ -313,7 +310,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
         }
     }
 
-    private void boxIfNecessary(SourceWriter writer, ValueType type, Fragment fragment) throws IOException {
+    private void boxIfNecessary(SourceWriter writer, ValueType type, Fragment fragment) {
         boolean boxed = false;
         if (type instanceof ValueType.Primitive) {
             switch (((ValueType.Primitive) type).getKind()) {
@@ -353,7 +350,7 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
         }
     }
 
-    private void unboxIfNecessary(SourceWriter writer, ValueType type, Fragment fragment) throws IOException {
+    private void unboxIfNecessary(SourceWriter writer, ValueType type, Fragment fragment) {
         boolean boxed = false;
         if (type instanceof ValueType.Primitive) {
             switch (((ValueType.Primitive) type).getKind()) {
@@ -392,10 +389,10 @@ public class ClassGenerator implements Generator, Injector, DependencyPlugin {
     }
 
     private interface Fragment {
-        void render() throws IOException;
+        void render();
     }
 
     private interface MemberRenderer<T extends MemberReader> {
-        void render(T member) throws IOException;
+        void render(T member);
     }
 }

classlib/src/main/java/org/teavm/classlib/java/lang/ClassLoaderNativeGenerator.java

@@ -23,7 +23,6 @@ import java.util.HashSet;
 import java.util.Properties;
 import java.util.ServiceLoader;
 import java.util.Set;
-import org.apache.commons.io.IOUtils;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.rendering.RenderingUtil;
 import org.teavm.backend.javascript.spi.Injector;
@@ -36,7 +35,7 @@ import org.teavm.model.MethodReference;
 
 public class ClassLoaderNativeGenerator implements Injector {
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "supplyResources":
                 generateSupplyResources(context);
@@ -44,7 +43,7 @@ public class ClassLoaderNativeGenerator implements Injector {
         }
     }
 
-    private void generateSupplyResources(InjectorContext context) throws IOException {
+    private void generateSupplyResources(InjectorContext context) {
         SourceWriter writer = context.getWriter();
         writer.append("{").indent();
 
@@ -69,7 +68,7 @@ public class ClassLoaderNativeGenerator implements Injector {
                 }
                 first = false;
                 writer.newLine();
-                byte[] dataBytes = Base64Impl.encode(IOUtils.toByteArray(new BufferedInputStream(input)), true);
+                byte[] dataBytes = Base64Impl.encode(new BufferedInputStream(input).readAllBytes(), true);
                 char[] dataChars = new char[dataBytes.length];
                 for (int i = 0; i < dataBytes.length; ++i) {
                     dataChars[i] = (char) dataBytes[i];
@@ -77,6 +76,8 @@ public class ClassLoaderNativeGenerator implements Injector {
                 RenderingUtil.writeString(writer, resource);
                 writer.append(':').ws();
                 RenderingUtil.writeString(writer, new String(dataChars));
+            } catch (IOException e) {
+                throw new RuntimeException(e);
             }
         }
 

classlib/src/main/java/org/teavm/classlib/java/lang/DoubleGenerator.java

@@ -15,14 +15,13 @@
  */
 package org.teavm.classlib.java.lang;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.spi.Injector;
 import org.teavm.backend.javascript.spi.InjectorContext;
 import org.teavm.model.MethodReference;
 
 public class DoubleGenerator implements Injector {
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         if (methodRef.getName().equals("doubleEqualsJs")) {
             context.getWriter().appendFunction("$rt_equalDoubles").append("(");
             context.writeExpr(context.getArgument(0));

classlib/src/main/java/org/teavm/classlib/java/lang/IntegerNativeGenerator.java

@@ -15,14 +15,13 @@
  */
 package org.teavm.classlib.java.lang;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.spi.Injector;
 import org.teavm.backend.javascript.spi.InjectorContext;
 import org.teavm.model.MethodReference;
 
 public class IntegerNativeGenerator implements Injector {
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "divideUnsigned":
                 generateRuntimeCall(context, "$rt_udiv");
@@ -37,7 +36,7 @@ public class IntegerNativeGenerator implements Injector {
     }
 
 
-    private void generateRuntimeCall(InjectorContext context, String name) throws IOException {
+    private void generateRuntimeCall(InjectorContext context, String name) {
         context.getWriter().appendFunction(name).append("(");
         context.writeExpr(context.getArgument(0));
         context.getWriter().append(",").ws();

classlib/src/main/java/org/teavm/classlib/java/lang/LongNativeGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.classlib.java.lang;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -23,7 +22,7 @@ import org.teavm.model.MethodReference;
 
 public class LongNativeGenerator implements Generator {
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "compare":
                 generateRuntimeCall(context, writer, "Long_compare");
@@ -40,7 +39,7 @@ public class LongNativeGenerator implements Generator {
         }
     }
 
-    private void generateRuntimeCall(GeneratorContext context, SourceWriter writer, String name) throws IOException {
+    private void generateRuntimeCall(GeneratorContext context, SourceWriter writer, String name) {
         writer.append("return ").appendFunction(name).append("(").append(context.getParameterName(1))
                 .append(",").ws()
                 .append(context.getParameterName(2)).append(");").softNewLine();

classlib/src/main/java/org/teavm/classlib/java/lang/MathNativeGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.classlib.java.lang;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -23,7 +22,7 @@ import org.teavm.model.MethodReference;
 
 public class MathNativeGenerator implements Generator {
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         String name = methodRef.getName();
         if (name.endsWith("Impl")) {
             name = name.substring(0, name.length() - 4);
@@ -34,8 +33,7 @@ public class MathNativeGenerator implements Generator {
         function(context, writer, name, methodRef.parameterCount());
     }
 
-    private void function(GeneratorContext context, SourceWriter writer, String name, int paramCount)
+    private void function(GeneratorContext context, SourceWriter writer, String name, int paramCount) {
-            throws IOException {
         writer.append("return ").append("$rt_globals.Math").append(".").append(name).append("(");
         for (int i = 0; i < paramCount; ++i) {
             if (i > 0) {

classlib/src/main/java/org/teavm/classlib/java/lang/SystemNativeGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.classlib.java.lang;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -26,12 +25,12 @@ import org.teavm.model.MethodReference;
 public class SystemNativeGenerator implements Generator {
     private JavaScriptTemplate template;
 
-    public SystemNativeGenerator(JavaScriptTemplateFactory templateFactory) throws IOException {
+    public SystemNativeGenerator(JavaScriptTemplateFactory templateFactory) {
         template = templateFactory.createFromResource("org/teavm/classlib/java/lang/System.js");
     }
 
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         var fragment = template.builder(methodRef.getName()).withContext(context).build();
         fragment.write(writer, 0);
     }

classlib/src/main/java/org/teavm/classlib/java/lang/reflect/ArrayNativeGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.classlib.java.lang.reflect;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -26,12 +25,12 @@ import org.teavm.model.MethodReference;
 public class ArrayNativeGenerator implements Generator {
     private JavaScriptTemplate template;
 
-    public ArrayNativeGenerator(JavaScriptTemplateFactory templateFactory) throws IOException {
+    public ArrayNativeGenerator(JavaScriptTemplateFactory templateFactory) {
         template = templateFactory.createFromResource("org/teavm/classlib/java/lang/reflect/Array.js");
     }
 
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         template.builder(methodRef.getName()).withContext(context).build().write(writer, 0);
     }
 }

core/src/main/java/org/teavm/backend/javascript/JavaScriptTarget.java

@@ -458,7 +458,7 @@ public class JavaScriptTarget implements TeaVMTarget, TeaVMJavaScriptHost {
         for (var entry : methodInjectors.entrySet()) {
             renderingContext.addInjector(entry.getKey(), entry.getValue());
         }
-        try {
+
         printWrapperStart(sourceWriter);
 
         for (RendererListener listener : rendererListeners) {
@@ -504,12 +504,9 @@ public class JavaScriptTarget implements TeaVMTarget, TeaVMJavaScriptHost {
 
         int totalSize = sourceWriter.getOffset() - start;
         printStats(renderer, totalSize);
-        } catch (IOException e) {
-            throw new RenderingException("IO Error occurred", e);
-        }
     }
 
-    private void printWrapperStart(SourceWriter writer) throws IOException {
+    private void printWrapperStart(SourceWriter writer) {
         writer.append("\"use strict\";").newLine();
         printUmdStart(writer);
         writer.append("function($rt_globals,").ws().append("$rt_exports");
@@ -523,7 +520,7 @@ public class JavaScriptTarget implements TeaVMTarget, TeaVMJavaScriptHost {
         return importedModules.get(name);
     }
 
-    private void printUmdStart(SourceWriter writer) throws IOException {
+    private void printUmdStart(SourceWriter writer) {
         writer.append("(function(root,").ws().append("module)").appendBlockStart();
         writer.appendIf().append("typeof define").ws().append("===").ws().append("'function'")
                 .ws().append("&&").ws().append("define.amd)").appendBlockStart();
@@ -562,7 +559,7 @@ public class JavaScriptTarget implements TeaVMTarget, TeaVMJavaScriptHost {
                 .ws();
     }
 
-    private void printWrapperEnd(SourceWriter writer) throws IOException {
+    private void printWrapperEnd(SourceWriter writer) {
         writer.outdent().append("}));").newLine();
     }
 

core/src/main/java/org/teavm/backend/javascript/ast/AstUtil.java

@@ -36,9 +36,11 @@ public final class AstUtil {
         return factory.parse(string, null, 0);
     }
 
-    public static AstNode parseFromResources(ClassLoader classLoader, String path) throws IOException {
+    public static AstNode parseFromResources(ClassLoader classLoader, String path) {
         try (var input = classLoader.getResourceAsStream(path)) {
             return parse(new String(input.readAllBytes(), StandardCharsets.UTF_8));
+        } catch (IOException e) {
+            throw new RuntimeException(e);
         }
     }
 }

core/src/main/java/org/teavm/backend/javascript/codegen/SourceWriter.java

@@ -42,39 +42,43 @@ public class SourceWriter implements Appendable, LocationProvider {
         this.minified = minified;
     }
 
-    public SourceWriter append(String value) throws IOException {
+    public SourceWriter append(String value) {
         append((CharSequence) value);
         return this;
     }
 
-    public SourceWriter appendBlockStart() throws IOException {
+    public SourceWriter appendBlockStart() {
         return ws().append("{").indent().softNewLine();
     }
 
-    public SourceWriter appendBlockEnd() throws IOException {
+    public SourceWriter appendBlockEnd() {
         return outdent().append("}").softNewLine();
     }
 
-    public SourceWriter appendIf() throws IOException {
+    public SourceWriter appendIf() {
         return append("if").ws().append("(");
     }
 
-    public SourceWriter appendElseIf() throws IOException {
+    public SourceWriter appendElseIf() {
         return outdent().append("}").ws().append("else ").appendIf();
     }
 
-    public SourceWriter appendElse() throws IOException {
+    public SourceWriter appendElse() {
         return outdent().append("}").ws().append("else").appendBlockStart();
     }
 
-    public SourceWriter append(int value) throws IOException {
+    public SourceWriter append(int value) {
         return append(String.valueOf(value));
     }
 
     @Override
-    public SourceWriter append(char value) throws IOException {
+    public SourceWriter append(char value) {
         appendIndent();
+        try {
             innerWriter.append(value);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
         if (value == '\n') {
             newLine();
         } else {
@@ -85,13 +89,13 @@ public class SourceWriter implements Appendable, LocationProvider {
     }
 
     @Override
-    public SourceWriter append(CharSequence csq) throws IOException {
+    public SourceWriter append(CharSequence csq) {
         append(csq, 0, csq.length());
         return this;
     }
 
     @Override
-    public SourceWriter append(CharSequence csq, int start, int end) throws IOException {
+    public SourceWriter append(CharSequence csq, int start, int end) {
         int last = start;
         for (int i = start; i < end; ++i) {
             if (csq.charAt(i) == '\n') {
@@ -104,65 +108,69 @@ public class SourceWriter implements Appendable, LocationProvider {
         return this;
     }
 
-    private void appendSingleLine(CharSequence csq, int start, int end) throws IOException {
+    private void appendSingleLine(CharSequence csq, int start, int end) {
         if (start == end) {
             return;
         }
         appendIndent();
         column += end - start;
         offset += end - start;
+        try {
             innerWriter.append(csq, start, end);
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
     }
 
-    public SourceWriter appendClass(String cls) throws IOException {
+    public SourceWriter appendClass(String cls) {
         return appendName(naming.getNameFor(cls));
     }
 
-    public SourceWriter appendClass(Class<?> cls) throws IOException {
+    public SourceWriter appendClass(Class<?> cls) {
         return appendClass(cls.getName());
     }
 
-    public SourceWriter appendField(FieldReference field) throws IOException {
+    public SourceWriter appendField(FieldReference field) {
         return append(naming.getNameFor(field));
     }
 
-    public SourceWriter appendStaticField(FieldReference field) throws IOException {
+    public SourceWriter appendStaticField(FieldReference field) {
         return appendName(naming.getFullNameFor(field));
     }
 
-    public SourceWriter appendMethod(MethodDescriptor method) throws IOException {
+    public SourceWriter appendMethod(MethodDescriptor method) {
         return append(naming.getNameFor(method));
     }
 
-    public SourceWriter appendMethod(String name, Class<?>... params) throws IOException {
+    public SourceWriter appendMethod(String name, Class<?>... params) {
         return append(naming.getNameFor(new MethodDescriptor(name, params)));
     }
 
-    public SourceWriter appendMethodBody(MethodReference method) throws IOException {
+    public SourceWriter appendMethodBody(MethodReference method) {
         return appendName(naming.getFullNameFor(method));
     }
 
-    public SourceWriter appendMethodBody(String className, String name, ValueType... params) throws IOException {
+    public SourceWriter appendMethodBody(String className, String name, ValueType... params) {
         return appendMethodBody(new MethodReference(className, new MethodDescriptor(name, params)));
     }
 
-    public SourceWriter appendMethodBody(Class<?> cls, String name, Class<?>... params) throws IOException {
+    public SourceWriter appendMethodBody(Class<?> cls, String name, Class<?>... params) {
         return appendMethodBody(new MethodReference(cls, name, params));
     }
 
-    public SourceWriter appendFunction(String name) throws IOException {
+    public SourceWriter appendFunction(String name) {
         return append(naming.getNameForFunction(name));
     }
 
-    public SourceWriter appendInit(MethodReference method) throws IOException {
+    public SourceWriter appendInit(MethodReference method) {
         return appendName(naming.getNameForInit(method));
     }
 
-    public SourceWriter appendClassInit(String className) throws IOException {
+    public SourceWriter appendClassInit(String className) {
         return appendName(naming.getNameForClassInit(className));
     }
 
-    private SourceWriter appendName(ScopedName name) throws IOException {
+    private SourceWriter appendName(ScopedName name) {
         if (name.scoped) {
             append(naming.getScopeName()).append(".");
         }
@@ -170,22 +178,30 @@ public class SourceWriter implements Appendable, LocationProvider {
         return this;
     }
 
-    private void appendIndent() throws IOException {
+    private void appendIndent() {
         if (minified) {
             return;
         }
         if (lineStart) {
+            try {
                 for (int i = 0; i < indentSize; ++i) {
                     innerWriter.append("    ");
                     column += 4;
                     offset += 4;
                 }
                 lineStart = false;
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
         }
     }
 
-    public SourceWriter newLine() throws IOException {
+    public SourceWriter newLine() {
+        try {
             innerWriter.append('\n');
+        } catch (IOException e) {
+            throw new RuntimeException(e);
+        }
         column = 0;
         ++line;
         ++offset;
@@ -193,12 +209,16 @@ public class SourceWriter implements Appendable, LocationProvider {
         return this;
     }
 
-    public SourceWriter ws() throws IOException {
+    public SourceWriter ws() {
         if (column >= lineWidth) {
             newLine();
         } else {
             if (!minified) {
+                try {
                     innerWriter.append(' ');
+                } catch (IOException e) {
+                    throw new RuntimeException(e);
+                }
                 column++;
                 offset++;
             }
@@ -206,16 +226,20 @@ public class SourceWriter implements Appendable, LocationProvider {
         return this;
     }
 
-    public SourceWriter tokenBoundary() throws IOException {
+    public SourceWriter tokenBoundary() {
         if (column >= lineWidth) {
             newLine();
         }
         return this;
     }
 
-    public SourceWriter softNewLine() throws IOException {
+    public SourceWriter softNewLine() {
         if (!minified) {
+            try {
                 innerWriter.append('\n');
+            } catch (IOException e) {
+                throw new RuntimeException(e);
+            }
             column = 0;
             ++offset;
             ++line;

core/src/main/java/org/teavm/backend/javascript/intrinsics/ref/ReferenceQueueGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.backend.javascript.intrinsics.ref;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -27,7 +26,7 @@ public class ReferenceQueueGenerator implements Generator {
     private JavaScriptTemplate template;
 
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         ensureTemplate(context);
         switch (methodRef.getName()) {
             case "<init>":
@@ -39,7 +38,7 @@ public class ReferenceQueueGenerator implements Generator {
         }
     }
 
-    private void ensureTemplate(GeneratorContext context) throws IOException {
+    private void ensureTemplate(GeneratorContext context) {
         if (template == null) {
             template = new JavaScriptTemplateFactory(context.getClassLoader(), context.getClassSource())
                     .createFromResource("org/teavm/classlib/java/lang/ref/ReferenceQueue.js");

core/src/main/java/org/teavm/backend/javascript/intrinsics/ref/WeakReferenceGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.backend.javascript.intrinsics.ref;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -27,15 +26,11 @@ public class WeakReferenceGenerator implements Generator {
     private JavaScriptTemplate template;
 
     public WeakReferenceGenerator(JavaScriptTemplateFactory templateFactory) {
-        try {
         template = templateFactory.createFromResource("org/teavm/classlib/java/lang/ref/WeakReference.js");
-        } catch (IOException e) {
-            throw new RuntimeException(e);
-        }
     }
 
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "<init>":
                 template.builder("init").withContext(context).build().write(writer, 0);

core/src/main/java/org/teavm/backend/javascript/rendering/AstWriter.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.backend.javascript.rendering;
 
-import java.io.IOException;
 import java.util.Collections;
 import java.util.HashMap;
 import java.util.HashSet;
@@ -155,19 +154,19 @@ public class AstWriter {
         });
     }
 
-    public void print(Object node) throws IOException {
+    public void print(Object node) {
         print((AstNode) node);
     }
 
-    public void print(Object node, int precedence) throws IOException {
+    public void print(Object node, int precedence) {
         print((AstNode) node, precedence);
     }
 
-    public void print(AstNode node) throws IOException {
+    public void print(AstNode node) {
         print(node, PRECEDENCE_COMMA);
     }
 
-    public void print(AstNode node, int precedence) throws IOException {
+    public void print(AstNode node, int precedence) {
         switch (node.getType()) {
             case Token.SCRIPT:
                 print((AstRoot) node);
@@ -305,14 +304,14 @@ public class AstWriter {
         }
     }
 
-    private void print(AstRoot node) throws IOException {
+    private void print(AstRoot node) {
         for (Node child : node) {
             print((AstNode) child);
             writer.softNewLine();
         }
     }
 
-    private void print(Block node) throws IOException {
+    private void print(Block node) {
         writer.append('{').softNewLine().indent();
         for (Node child = node.getFirstChild(); child != null; child = child.getNext()) {
             print((AstNode) child);
@@ -321,7 +320,7 @@ public class AstWriter {
         writer.outdent().append('}');
     }
 
-    private void print(Scope node) throws IOException {
+    private void print(Scope node) {
         var scope = enterScope(node);
         writer.append('{').softNewLine().indent();
         for (Node child = node.getFirstChild(); child != null; child = child.getNext()) {
@@ -332,14 +331,14 @@ public class AstWriter {
         leaveScope(scope);
     }
 
-    private void print(LabeledStatement node) throws IOException {
+    private void print(LabeledStatement node) {
         for (Label label : node.getLabels()) {
             writer.append(label.getName()).append(':').ws();
         }
         print(node.getStatement());
     }
 
-    private void print(BreakStatement node) throws IOException {
+    private void print(BreakStatement node) {
         writer.append("break");
         if (node.getBreakLabel() != null) {
             writer.append(' ').append(node.getBreakLabel().getString());
@@ -347,7 +346,7 @@ public class AstWriter {
         writer.append(';');
     }
 
-    private void print(ContinueStatement node) throws IOException {
+    private void print(ContinueStatement node) {
         writer.append("continue");
         if (node.getLabel() != null) {
             writer.append(' ').append(node.getLabel().getString());
@@ -355,7 +354,7 @@ public class AstWriter {
         writer.append(';');
     }
 
-    private void print(ReturnStatement node) throws IOException {
+    private void print(ReturnStatement node) {
         writer.append("return");
         if (node.getReturnValue() != null) {
             writer.append(' ');
@@ -364,13 +363,13 @@ public class AstWriter {
         writer.append(';');
     }
 
-    private void print(ThrowStatement node) throws IOException {
+    private void print(ThrowStatement node) {
         writer.append("throw ");
         print(node.getExpression());
         writer.append(';');
     }
 
-    private void print(DoLoop node) throws IOException {
+    private void print(DoLoop node) {
         var scope = enterScope(node);
         writer.append("do ").ws();
         print(node.getBody());
@@ -380,7 +379,7 @@ public class AstWriter {
         leaveScope(scope);
     }
 
-    private void print(ForInLoop node) throws IOException {
+    private void print(ForInLoop node) {
         var scope = enterScope(node);
         writer.append("for");
         if (node.isForEach()) {
@@ -395,7 +394,7 @@ public class AstWriter {
         leaveScope(scope);
     }
 
-    private void print(ForLoop node) throws IOException {
+    private void print(ForLoop node) {
         var scope = enterScope(node);
         writer.append("for").ws().append('(');
         print(node.getInitializer());
@@ -408,7 +407,7 @@ public class AstWriter {
         leaveScope(scope);
     }
 
-    private void print(WhileLoop node) throws IOException {
+    private void print(WhileLoop node) {
         var scope = enterScope(node);
         writer.append("while").ws().append('(');
         print(node.getCondition());
@@ -417,7 +416,7 @@ public class AstWriter {
         leaveScope(scope);
     }
 
-    private void print(IfStatement node) throws IOException {
+    private void print(IfStatement node) {
         writer.append("if").ws().append('(');
         print(node.getCondition());
         writer.append(')').ws();
@@ -428,7 +427,7 @@ public class AstWriter {
         }
     }
 
-    private void print(SwitchStatement node) throws IOException {
+    private void print(SwitchStatement node) {
         writer.append("switch").ws().append('(');
         print(node.getExpression());
         writer.append(')').ws().append('{').indent().softNewLine();
@@ -452,7 +451,7 @@ public class AstWriter {
         writer.outdent().append('}');
     }
 
-    private void print(TryStatement node) throws IOException {
+    private void print(TryStatement node) {
         writer.append("try ");
         print(node.getTryBlock());
         for (CatchClause cc : node.getCatchClauses()) {
@@ -471,7 +470,7 @@ public class AstWriter {
         }
     }
 
-    private void print(VariableDeclaration node) throws IOException {
+    private void print(VariableDeclaration node) {
         switch (node.getType()) {
             case Token.VAR:
                 writer.append("var ");
@@ -495,7 +494,7 @@ public class AstWriter {
         }
     }
 
-    private void print(VariableInitializer node) throws IOException {
+    private void print(VariableInitializer node) {
         print(node.getTarget());
         if (node.getInitializer() != null) {
             writer.ws().append('=').ws();
@@ -503,19 +502,19 @@ public class AstWriter {
         }
     }
 
-    private void print(ExpressionStatement node) throws IOException {
+    private void print(ExpressionStatement node) {
         print(node.getExpression());
         writer.append(';');
     }
 
-    protected void print(ElementGet node) throws IOException {
+    protected void print(ElementGet node) {
         print(node.getTarget(), PRECEDENCE_MEMBER);
         writer.append('[');
         print(node.getElement());
         writer.append(']');
     }
 
-    public void print(PropertyGet node) throws IOException {
+    public void print(PropertyGet node) {
         print(node.getLeft(), PRECEDENCE_MEMBER);
         writer.append('.');
         var oldRootScope = rootScope;
@@ -524,7 +523,7 @@ public class AstWriter {
         rootScope = oldRootScope;
     }
 
-    private void print(FunctionCall node, int precedence) throws IOException {
+    private void print(FunctionCall node, int precedence) {
         if (intrinsic(node, precedence)) {
             return;
         }
@@ -556,11 +555,11 @@ public class AstWriter {
         }
     }
 
-    protected boolean intrinsic(FunctionCall node, int precedence) throws IOException {
+    protected boolean intrinsic(FunctionCall node, int precedence) {
         return false;
     }
 
-    private boolean tryJavaInvocation(FunctionCall node) throws IOException {
+    private boolean tryJavaInvocation(FunctionCall node) {
         if (!(node.getTarget() instanceof PropertyGet)) {
             return false;
         }
@@ -593,7 +592,7 @@ public class AstWriter {
         return str.substring("$$JSO$$_".length());
     }
 
-    private void print(ConditionalExpression node, int precedence) throws IOException {
+    private void print(ConditionalExpression node, int precedence) {
         if (precedence < PRECEDENCE_COND) {
             writer.append('(');
         }
@@ -607,7 +606,7 @@ public class AstWriter {
         }
     }
 
-    private void printList(List<? extends AstNode> nodes) throws IOException {
+    private void printList(List<? extends AstNode> nodes) {
         if (nodes == null || nodes.isEmpty()) {
             return;
         }
@@ -618,7 +617,7 @@ public class AstWriter {
         }
     }
 
-    private void print(ArrayComprehension node) throws IOException {
+    private void print(ArrayComprehension node) {
         var scope = enterScope(node);
         writer.append("[");
         for (ArrayComprehensionLoop loop : node.getLoops()) {
@@ -638,7 +637,7 @@ public class AstWriter {
         leaveScope(scope);
     }
 
-    private void print(GeneratorExpression node) throws IOException {
+    private void print(GeneratorExpression node) {
         var scope = enterScope(node);
         writer.append("(");
         for (GeneratorExpressionLoop loop : node.getLoops()) {
@@ -658,17 +657,17 @@ public class AstWriter {
         leaveScope(scope);
     }
 
-    private void print(NumberLiteral node) throws IOException {
+    private void print(NumberLiteral node) {
         writer.append(node.getValue());
     }
 
-    private void print(StringLiteral node) throws IOException {
+    private void print(StringLiteral node) {
         writer.append(node.getQuoteCharacter());
         writer.append(ScriptRuntime.escapeString(node.getValue(), node.getQuoteCharacter()));
         writer.append(node.getQuoteCharacter());
     }
 
-    public void print(Name node, int precedence) throws IOException {
+    public void print(Name node, int precedence) {
         var definingScope = scopeOfId(node.getIdentifier());
         if (rootScope && definingScope == null) {
             var alias = nameMap.get(node.getIdentifier());
@@ -685,17 +684,17 @@ public class AstWriter {
         }
     }
 
-    private void print(RegExpLiteral node) throws IOException {
+    private void print(RegExpLiteral node) {
         writer.append('/').append(node.getValue()).append('/').append(node.getFlags());
     }
 
-    private void print(ArrayLiteral node) throws IOException {
+    private void print(ArrayLiteral node) {
         writer.append('[');
         printList(node.getElements());
         writer.append(']');
     }
 
-    private void print(ObjectLiteral node) throws IOException {
+    private void print(ObjectLiteral node) {
         writer.append('{').ws();
         if (node.getElements() != null && !node.getElements().isEmpty()) {
             print(node.getElements().get(0));
@@ -707,7 +706,7 @@ public class AstWriter {
         writer.ws().append('}');
     }
 
-    private void print(ObjectProperty node) throws IOException {
+    private void print(ObjectProperty node) {
         if (node.isGetterMethod()) {
             writer.append("get ");
         } else if (node.isSetterMethod()) {
@@ -723,7 +722,7 @@ public class AstWriter {
         print(node.getRight());
     }
 
-    private void print(FunctionNode node) throws IOException {
+    private void print(FunctionNode node) {
         var scope = enterScope(node);
         var isArrow = node.getFunctionType() == FunctionNode.ARROW_FUNCTION;
         if (!isArrow) {
@@ -761,7 +760,7 @@ public class AstWriter {
         leaveScope(scope);
     }
 
-    private void print(LetNode node) throws IOException {
+    private void print(LetNode node) {
         var scope = enterScope(node);
         writer.append("let").ws().append('(');
         printList(node.getVariables().getVariables());
@@ -770,11 +769,11 @@ public class AstWriter {
         leaveScope(scope);
     }
 
-    private void print(ParenthesizedExpression node, int precedence) throws IOException {
+    private void print(ParenthesizedExpression node, int precedence) {
         print(node.getExpression(), precedence);
     }
 
-    private void printUnary(UnaryExpression node, int precedence) throws IOException {
+    private void printUnary(UnaryExpression node, int precedence) {
         int innerPrecedence = PRECEDENCE_PREFIX;
 
         if (innerPrecedence > precedence) {
@@ -797,7 +796,7 @@ public class AstWriter {
         }
     }
 
-    private void printUnary(UpdateExpression node, int precedence) throws IOException {
+    private void printUnary(UpdateExpression node, int precedence) {
         int innerPrecedence = node.isPostfix() ? PRECEDENCE_POSTFIX : PRECEDENCE_PREFIX;
 
         if (innerPrecedence > precedence) {
@@ -826,7 +825,7 @@ public class AstWriter {
         }
     }
 
-    private void printInfix(InfixExpression node, int precedence) throws IOException {
+    private void printInfix(InfixExpression node, int precedence) {
         int innerPrecedence = getPrecedence(node.getType());
 
         if (innerPrecedence > precedence) {

core/src/main/java/org/teavm/backend/javascript/rendering/NameEmitter.java

@@ -15,8 +15,6 @@
  */
 package org.teavm.backend.javascript.rendering;
 
-import java.io.IOException;
-
 public interface NameEmitter {
-    void emit(int precedence) throws IOException;
+    void emit(int precedence);
 }

core/src/main/java/org/teavm/backend/javascript/rendering/Renderer.java

@@ -17,7 +17,6 @@ package org.teavm.backend.javascript.rendering;
 
 import com.carrotsearch.hppc.ObjectIntHashMap;
 import com.carrotsearch.hppc.ObjectIntMap;
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.HashMap;
@@ -181,7 +180,6 @@ public class Renderer implements RenderingManager {
         if (context.getStringPool().isEmpty()) {
             return;
         }
-        try {
         int start = writer.getOffset();
         writer.appendFunction("$rt_stringPool").append("([");
         for (int i = 0; i < context.getStringPool().size(); ++i) {
@@ -192,13 +190,9 @@ public class Renderer implements RenderingManager {
         }
         writer.append("]);").newLine();
         stringPoolSize = writer.getOffset() - start;
-        } catch (IOException e) {
-            throw new RenderingException("IO error", e);
-        }
     }
 
     public void renderStringConstants() throws RenderingException {
-        try {
         for (PostponedFieldInitializer initializer : postponedFieldInitializers) {
             int start = writer.getOffset();
             writer.appendStaticField(initializer.field).ws().append("=").ws();
@@ -207,22 +201,15 @@ public class Renderer implements RenderingManager {
             int sz = writer.getOffset() - start;
             appendClassSize(initializer.field.getClassName(), sz);
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error", e);
-        }
     }
 
     public void renderCompatibilityStubs() throws RenderingException {
-        try {
         renderJavaStringToString();
         renderJavaObjectToString();
         renderTeaVMClass();
-        } catch (IOException e) {
-            throw new RenderingException("IO error", e);
-        }
     }
 
-    private void renderJavaStringToString() throws IOException {
+    private void renderJavaStringToString() {
         writer.appendClass("java.lang.String").append(".prototype.toString").ws().append("=").ws().append("()")
                 .ws().append("=>").ws().append("{").indent().softNewLine();
         writer.append("return ").appendFunction("$rt_ustr").append("(this);").softNewLine();
@@ -231,7 +218,7 @@ public class Renderer implements RenderingManager {
             .appendClass("java.lang.String").append(".prototype.toString;").softNewLine();
     }
 
-    private void renderJavaObjectToString() throws IOException {
+    private void renderJavaObjectToString() {
         writer.appendClass("java.lang.Object").append(".prototype.toString").ws().append("=").ws()
                 .append("()").ws().append("=>").ws().append("{").indent().softNewLine();
         writer.append("return ").appendFunction("$rt_ustr").append("(")
@@ -240,7 +227,7 @@ public class Renderer implements RenderingManager {
         writer.outdent().append("};").newLine();
     }
 
-    private void renderTeaVMClass() throws IOException {
+    private void renderTeaVMClass() {
         writer.appendClass("java.lang.Object").append(".prototype.__teavm_class__").ws().append("=").ws()
                 .append("function()").ws().append("{").indent().softNewLine();
         writer.append("return ").appendFunction("$dbg_class").append("(this);").softNewLine();
@@ -282,7 +269,6 @@ public class Renderer implements RenderingManager {
     private void renderDeclaration(PreparedClass cls) throws RenderingException {
         ScopedName jsName = naming.getNameFor(cls.getName());
         debugEmitter.addClass(jsName.value, cls.getName(), cls.getParentName());
-        try {
         List<FieldHolder> nonStaticFields = new ArrayList<>();
         List<FieldHolder> staticFields = new ArrayList<>();
         for (FieldHolder field : cls.getClassHolder().getFields()) {
@@ -321,13 +307,10 @@ public class Renderer implements RenderingManager {
             context.constantToString(writer, value);
             writer.append(";").softNewLine();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     private void renderFullClassFunctionDeclaration(PreparedClass cls, ScopedName jsName,
-            List<FieldHolder> nonStaticFields) throws IOException {
+            List<FieldHolder> nonStaticFields) {
         boolean thisAliased = false;
         renderFunctionDeclaration(jsName);
         writer.append("()").ws().append("{").indent().softNewLine();
@@ -364,7 +347,7 @@ public class Renderer implements RenderingManager {
         writer.newLine();
     }
 
-    private void renderShortClassFunctionDeclaration(PreparedClass cls, ScopedName jsName) throws IOException {
+    private void renderShortClassFunctionDeclaration(PreparedClass cls, ScopedName jsName) {
         if (jsName.scoped) {
             writer.append(naming.getScopeName()).append(".");
         } else {
@@ -381,7 +364,7 @@ public class Renderer implements RenderingManager {
 
     private void renderMethodBodies(PreparedClass cls) throws RenderingException {
         debugEmitter.emitClass(cls.getName());
-        try {
+
         MethodReader clinit = classSource.get(cls.getName()).getMethod(CLINIT_METHOD);
 
         if (clinit != null && context.isDynamicInitializer(cls.getName())) {
@@ -401,14 +384,11 @@ public class Renderer implements RenderingManager {
         for (PreparedMethod method : cls.getMethods()) {
             renderBody(method);
         }
-        } catch (IOException e) {
+
-            throw new RenderingException("IO error occurred", e);
-        }
         debugEmitter.emitClass(null);
     }
 
-    private void renderCallClinit(MethodReader clinit, PreparedClass cls)
+    private void renderCallClinit(MethodReader clinit, PreparedClass cls) {
-            throws IOException {
         boolean isAsync = asyncMethods.contains(clinit.getReference());
 
         ScopedName className = naming.getNameFor(cls.getName());
@@ -470,7 +450,7 @@ public class Renderer implements RenderingManager {
         writer.newLine();
     }
 
-    private void renderEraseClinit(PreparedClass cls) throws IOException {
+    private void renderEraseClinit(PreparedClass cls) {
         writer.appendClassInit(cls.getName()).ws().append("=").ws()
                 .appendFunction("$rt_eraseClinit").append("(")
                 .appendClass(cls.getName()).append(");").softNewLine();
@@ -484,7 +464,7 @@ public class Renderer implements RenderingManager {
         ClassMetadataRequirements metadataRequirements = new ClassMetadataRequirements(context.getDependencyInfo());
 
         int start = writer.getOffset();
-        try {
+
         writer.appendFunction("$rt_packages").append("([");
         ObjectIntMap<String> packageIndexes = generatePackageMetadata(classes, metadataRequirements);
         writer.append("]);").newLine();
@@ -494,15 +474,11 @@ public class Renderer implements RenderingManager {
             renderClassMetadataPortion(classes.subList(i, j), packageIndexes, metadataRequirements);
         }
 
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
-
         metadataSize = writer.getOffset() - start;
     }
 
     private void renderClassMetadataPortion(List<PreparedClass> classes, ObjectIntMap<String> packageIndexes,
-            ClassMetadataRequirements metadataRequirements) throws IOException {
+            ClassMetadataRequirements metadataRequirements) {
         writer.appendFunction("$rt_metadata").append("([");
         boolean first = true;
         for (PreparedClass cls : classes) {
@@ -597,7 +573,7 @@ public class Renderer implements RenderingManager {
     }
 
     private ObjectIntMap<String> generatePackageMetadata(List<PreparedClass> classes,
-            ClassMetadataRequirements metadataRequirements) throws IOException {
+            ClassMetadataRequirements metadataRequirements) {
         PackageNode root = new PackageNode(null);
 
         for (PreparedClass classNode : classes) {
@@ -621,8 +597,7 @@ public class Renderer implements RenderingManager {
         return indexes;
     }
 
-    private int writePackageStructure(PackageNode node, int startIndex, String prefix, ObjectIntMap<String> indexes)
+    private int writePackageStructure(PackageNode node, int startIndex, String prefix, ObjectIntMap<String> indexes) {
-            throws IOException {
         int index = startIndex;
         for (PackageNode child : node.children.values()) {
             if (index >= 0) {
@@ -738,7 +713,7 @@ public class Renderer implements RenderingManager {
         return null;
     }
 
-    private void renderInitializer(PreparedMethod method) throws IOException {
+    private void renderInitializer(PreparedMethod method) {
         MethodReference ref = method.reference;
         debugEmitter.emitMethod(ref.getDescriptor());
         ScopedName name = naming.getNameForInit(ref);
@@ -774,7 +749,7 @@ public class Renderer implements RenderingManager {
         return minifying ? RenderingUtil.indexToId(index) : "var_" + index;
     }
 
-    private void renderVirtualDeclarations(Collection<MethodReference> methods) throws IOException {
+    private void renderVirtualDeclarations(Collection<MethodReference> methods) {
         if (methods.stream().noneMatch(this::isVirtual)) {
             writer.append('0');
             return;
@@ -797,14 +772,14 @@ public class Renderer implements RenderingManager {
         writer.append("]");
     }
 
-    private void emitVirtualDeclaration(MethodReference ref) throws IOException {
+    private void emitVirtualDeclaration(MethodReference ref) {
         String methodName = naming.getNameFor(ref.getDescriptor());
         writer.append("\"").append(methodName).append("\"");
         writer.append(",").ws();
         emitVirtualFunctionWrapper(ref);
     }
 
-    private void emitVirtualFunctionWrapper(MethodReference method) throws IOException {
+    private void emitVirtualFunctionWrapper(MethodReference method) {
         if (method.parameterCount() <= 4) {
             writer.appendFunction("$rt_wrapFunction" + method.parameterCount());
             writer.append("(").appendMethodBody(method).append(")");
@@ -834,7 +809,7 @@ public class Renderer implements RenderingManager {
         writer.append(");").ws().append("}");
     }
 
-    private void renderBody(PreparedMethod method) throws IOException {
+    private void renderBody(PreparedMethod method) {
         StatementRenderer statementRenderer = new StatementRenderer(context, writer);
         statementRenderer.setCurrentMethod(method.node);
 
@@ -886,7 +861,7 @@ public class Renderer implements RenderingManager {
         return body instanceof ReturnStatement && ((ReturnStatement) body).getResult() == null;
     }
 
-    private void renderFunctionDeclaration(ScopedName name) throws IOException {
+    private void renderFunctionDeclaration(ScopedName name) {
         if (name.scoped) {
             writer.append(naming.getScopeName()).append(".").append(name.value).ws().append("=").ws();
         }
@@ -896,14 +871,14 @@ public class Renderer implements RenderingManager {
         }
     }
 
-    private void renderAsyncPrologue() throws IOException {
+    private void renderAsyncPrologue() {
         writer.append(context.mainLoopName()).append(":").ws().append("while").ws().append("(true)")
                 .ws().append("{").ws();
         writer.append("switch").ws().append("(").append(context.pointerName()).append(")").ws()
                 .append('{').softNewLine();
     }
 
-    private void renderAsyncEpilogue() throws IOException {
+    private void renderAsyncEpilogue() {
         writer.append("default:").ws().appendFunction("$rt_invalidPointer").append("();").softNewLine();
         writer.append("}}").softNewLine();
     }
@@ -922,18 +897,13 @@ public class Renderer implements RenderingManager {
         }
 
         public void renderNative(PreparedMethod method) {
-            try {
             this.async = method.async;
             statementRenderer.setAsync(method.async);
             method.generator.generate(this, writer, method.reference);
-            } catch (IOException e) {
-                throw new RenderingException("IO error occurred", e);
-            }
         }
 
         @Override
         public void visit(RegularMethodNode method) {
-            try {
             statementRenderer.setAsync(false);
             this.async = false;
             MethodReference ref = method.getReference();
@@ -991,16 +961,11 @@ public class Renderer implements RenderingManager {
 
                 writer.outdent().append("}").softNewLine();
             }
-
-            } catch (IOException e) {
-                throw new RenderingException("IO error occurred", e);
-            }
         }
 
         @Override
         public void visit(AsyncMethodNode methodNode) {
             threadLibraryUsed = true;
-            try {
             statementRenderer.setAsync(true);
             this.async = true;
             MethodReference ref = methodNode.getReference();
@@ -1098,9 +1063,6 @@ public class Renderer implements RenderingManager {
             }
             writer.append(context.pointerName()).append(");");
             writer.softNewLine();
-            } catch (IOException e) {
-                throw new RenderingException("IO error occurred", e);
-            }
         }
 
         @Override
@@ -1155,11 +1117,7 @@ public class Renderer implements RenderingManager {
 
         @Override
         public void typeToClassString(SourceWriter writer, ValueType type) {
-            try {
             context.typeToClsString(writer, type);
-            } catch (IOException e) {
-                throw new RuntimeException(e);
-            }
         }
 
         @Override
@@ -1178,7 +1136,7 @@ public class Renderer implements RenderingManager {
         }
     }
 
-    private void appendMonitor(StatementRenderer statementRenderer, MethodNode methodNode) throws IOException {
+    private void appendMonitor(StatementRenderer statementRenderer, MethodNode methodNode) {
         if (methodNode.getModifiers().contains(ElementModifier.STATIC)) {
             writer.appendFunction("$rt_cls").append("(")
                     .appendClass(methodNode.getReference().getClassName()).append(")");

core/src/main/java/org/teavm/backend/javascript/rendering/RenderingContext.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.backend.javascript.rendering;
 
-import java.io.IOException;
 import java.lang.reflect.Constructor;
 import java.lang.reflect.InvocationTargetException;
 import java.util.ArrayDeque;
@@ -222,7 +221,7 @@ public abstract class RenderingContext {
         return readonlyStringPool;
     }
 
-    public void constantToString(SourceWriter writer, Object cst) throws IOException {
+    public void constantToString(SourceWriter writer, Object cst) {
         if (cst == null) {
             writer.append("null");
         }
@@ -297,7 +296,7 @@ public abstract class RenderingContext {
         }
     }
 
-    public void typeToClsString(SourceWriter writer, ValueType type) throws IOException {
+    public void typeToClsString(SourceWriter writer, ValueType type) {
         int arrayCount = 0;
         while (type instanceof ValueType.Array) {
             arrayCount++;

core/src/main/java/org/teavm/backend/javascript/rendering/RenderingUtil.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.backend.javascript.rendering;
 
-import java.io.IOException;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.HashSet;
@@ -45,7 +44,7 @@ public final class RenderingUtil {
         return sb.toString();
     }
 
-    public static void writeString(SourceWriter writer, String s) throws IOException {
+    public static void writeString(SourceWriter writer, String s) {
         if (s.isEmpty()) {
             writer.append("\"\"");
             return;

core/src/main/java/org/teavm/backend/javascript/rendering/RuntimeRenderer.java

@@ -39,15 +39,11 @@ public class RuntimeRenderer {
     }
 
     public void renderRuntime() throws RenderingException {
-        try {
         renderHandWrittenRuntime("runtime.js");
         renderHandWrittenRuntime("intern.js");
-        } catch (IOException e) {
-            throw new RenderingException("IO error", e);
-        }
     }
 
-    public void renderHandWrittenRuntime(String name) throws IOException {
+    public void renderHandWrittenRuntime(String name)  {
         AstRoot ast = parseRuntime(name);
         ast.visit(new StringConstantElimination());
         new TemplatingAstTransformer(classSource).visit(ast);
@@ -56,7 +52,7 @@ public class RuntimeRenderer {
         astWriter.print(ast);
     }
 
-    private AstRoot parseRuntime(String name) throws IOException {
+    private AstRoot parseRuntime(String name) {
         CompilerEnvirons env = new CompilerEnvirons();
         env.setRecoverFromErrors(true);
         env.setLanguageVersion(Context.VERSION_1_8);
@@ -66,6 +62,8 @@ public class RuntimeRenderer {
         try (InputStream input = loader.getResourceAsStream("org/teavm/backend/javascript/" + name);
                 Reader reader = new InputStreamReader(input, StandardCharsets.UTF_8)) {
             return factory.parse(reader, null, 0);
+        } catch (IOException e) {
+            throw new RenderingException(e);
         }
     }
 }

core/src/main/java/org/teavm/backend/javascript/rendering/StatementRenderer.java

@@ -17,7 +17,6 @@ package org.teavm.backend.javascript.rendering;
 
 import com.carrotsearch.hppc.IntArrayList;
 import com.carrotsearch.hppc.IntIndexedContainer;
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.Collections;
 import java.util.HashMap;
@@ -146,7 +145,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
 
     @Override
     public void visit(AssignmentStatement statement) throws RenderingException {
-        try {
         debugEmitter.emitStatementStart();
         if (statement.getLocation() != null) {
             pushLocation(statement.getLocation());
@@ -176,9 +174,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (statement.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
@@ -188,7 +183,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
 
     @Override
     public void visit(ConditionalStatement statement) {
-        try {
         boolean needClosingBracket;
         while (true) {
             debugEmitter.emitStatementStart();
@@ -243,9 +237,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (needClosingBracket) {
             writer.append("}").softNewLine();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     private boolean isSimpleIfContent(List<Statement> statements) {
@@ -259,7 +250,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
 
     @Override
     public void visit(SwitchStatement statement) {
-        try {
         debugEmitter.emitStatementStart();
         if (statement.getValue().getLocation() != null) {
             pushLocation(statement.getValue().getLocation());
@@ -300,14 +290,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
             writer.outdent();
         }
         writer.outdent().append("}").softNewLine();
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(WhileStatement statement) {
-        try {
         debugEmitter.emitStatementStart();
         if (statement.getId() != null) {
             writer.append(mapBlockId(statement.getId())).append(":").ws();
@@ -330,9 +316,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         }
         end = oldEnd;
         writer.outdent().append("}").softNewLine();
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     private String mapBlockId(String id) {
@@ -361,18 +344,13 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
 
     @Override
     public void visit(BlockStatement statement) {
-        try {
         writer.append(mapBlockId(statement.getId())).append(":").ws().append("{").softNewLine().indent();
         visitStatements(statement.getBody());
         writer.outdent().append("}").softNewLine();
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(BreakStatement statement) {
-        try {
         debugEmitter.emitStatementStart();
         if (statement.getLocation() != null) {
             pushLocation(statement.getLocation());
@@ -385,14 +363,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (statement.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(ContinueStatement statement) {
-        try {
         debugEmitter.emitStatementStart();
         if (statement.getLocation() != null) {
             pushLocation(statement.getLocation());
@@ -405,14 +379,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (statement.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(ReturnStatement statement) {
-        try {
         debugEmitter.emitStatementStart();
         if (statement.getLocation() != null) {
             pushLocation(statement.getLocation());
@@ -429,14 +399,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (statement.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(ThrowStatement statement) {
-        try {
         debugEmitter.emitStatementStart();
         if (statement.getLocation() != null) {
             pushLocation(statement.getLocation());
@@ -450,9 +416,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (statement.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
@@ -465,7 +428,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (method == null) {
             return;
         }
-        try {
         debugEmitter.emitStatementStart();
         if (statement.getLocation() != null) {
             pushLocation(statement.getLocation());
@@ -477,9 +439,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (statement.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     public String variableName(int index) {
@@ -492,13 +451,7 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         }
         if (guarded) {
             visitBinary(BinaryOperation.OR, "|", () -> visitBinary(expr, op, false),
-                    () -> {
+                    () -> writer.append("0"));
-                        try {
-                            writer.append("0");
-                        } catch (IOException e) {
-                            throw new RenderingException("IO error occurred", e);
-                        }
-                    });
         } else {
             visitBinary(expr.getOperation(), op, () -> expr.getFirstOperand().acceptVisitor(this),
                     () -> expr.getSecondOperand().acceptVisitor(this));
@@ -509,7 +462,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
     }
 
     private void visitBinary(BinaryOperation operation, String infixText, Runnable a, Runnable b) {
-        try {
         Precedence outerPrecedence = precedence;
         Precedence innerPrecedence = getPrecedence(operation);
         if (innerPrecedence.ordinal() < outerPrecedence.ordinal()) {
@@ -557,9 +509,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (innerPrecedence.ordinal() < outerPrecedence.ordinal()) {
             writer.append(')');
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     private static Precedence getPrecedence(BinaryOperation op) {
@@ -600,7 +549,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
     }
 
     private void visitBinaryFunction(BinaryExpr expr, String function) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -615,9 +563,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
@@ -764,7 +709,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
 
     @Override
     public void visit(UnaryExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -869,15 +813,11 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(CastExpr expr) {
         if (context.isStrict()) {
-            try {
             if (expr.getLocation() != null) {
                 pushLocation(expr.getLocation());
             }
@@ -896,9 +836,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
             if (expr.getLocation() != null) {
                 popLocation();
             }
-            } catch (IOException e) {
-                throw new RenderingException("IO error occurred", e);
-            }
         } else {
             expr.getValue().acceptVisitor(this);
         }
@@ -915,7 +852,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
 
     @Override
     public void visit(PrimitiveCastExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -967,13 +903,7 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
                         break;
                     case INT:
                         visitBinary(BinaryOperation.BITWISE_OR, "|", () -> expr.getValue().acceptVisitor(this),
-                                    () -> {
+                                () -> writer.append("0"));
-                                        try {
-                                            writer.append("0");
-                                        } catch (IOException e) {
-                                            throw new RenderingException("IO error occurred", e);
-                                        }
-                                    });
                         break;
                     default:
                         expr.getValue().acceptVisitor(this);
@@ -983,9 +913,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     private Expr extractLongRightShiftedBy32(Expr expr) {
@@ -1015,7 +942,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
 
     @Override
     public void visit(ConditionalExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1041,14 +967,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(ConstantExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1056,14 +978,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(VariableExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1071,14 +989,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(SubscriptExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1091,14 +1005,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(UnwrapArrayExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1108,14 +1018,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(InvocationExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1207,14 +1113,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(QualificationExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1230,14 +1132,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(NewExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1257,14 +1155,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(NewArrayExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1331,14 +1225,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(ArrayFromDataExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1384,12 +1274,9 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
-    private void writeCommaSeparated(List<Expr> expressions) throws IOException {
+    private void writeCommaSeparated(List<Expr> expressions) {
         boolean first = true;
         for (Expr element : expressions) {
             if (!first) {
@@ -1403,7 +1290,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
 
     @Override
     public void visit(NewMultiArrayExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1459,14 +1345,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(InstanceOfExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1493,9 +1375,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     private void visitStatements(List<Statement> statements) {
@@ -1514,7 +1393,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
 
     @Override
     public void visit(TryCatchStatement statement) {
-        try {
         writer.append("try").ws().append("{").softNewLine().indent();
         List<TryCatchStatement> sequence = new ArrayList<>();
         sequence.add(statement);
@@ -1574,14 +1452,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
             writer.softNewLine();
         }
         writer.outdent().append("}").softNewLine();
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     @Override
     public void visit(GotoPartStatement statement) {
-        try {
         if (statement.getPart() != currentPart) {
             writer.append(context.pointerName()).ws().append("=").ws().append(statement.getPart()).append(";")
                     .softNewLine();
@@ -1589,14 +1463,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (!end || statement.getPart() != currentPart + 1) {
             writer.append("continue ").append(context.mainLoopName()).append(";").softNewLine();
         }
-        } catch (IOException ex) {
-            throw new RenderingException("IO error occurred", ex);
-        }
     }
 
     @Override
     public void visit(MonitorEnterStatement statement) {
-        try {
         if (async) {
             writer.appendMethodBody(NameFrequencyEstimator.MONITOR_ENTER_METHOD).append("(");
             precedence = Precedence.min();
@@ -1609,12 +1479,9 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
             statement.getObjectRef().acceptVisitor(this);
             writer.append(");").softNewLine();
         }
-        } catch (IOException ex) {
-            throw new RenderingException("IO error occurred", ex);
-        }
     }
 
-    public void emitSuspendChecker() throws IOException {
+    public void emitSuspendChecker() {
         writer.append("if").ws().append("(").appendFunction("$rt_suspending").append("())").ws()
                 .append("{").indent().softNewLine();
         writer.append("break ").append(context.mainLoopName()).append(";").softNewLine();
@@ -1623,7 +1490,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
 
     @Override
     public void visit(MonitorExitStatement statement) {
-        try {
         if (async) {
             writer.appendMethodBody(NameFrequencyEstimator.MONITOR_EXIT_METHOD).append("(");
             precedence = Precedence.min();
@@ -1635,14 +1501,10 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
             statement.getObjectRef().acceptVisitor(this);
             writer.append(");").softNewLine();
         }
-        } catch (IOException ex) {
-            throw new RenderingException("IO error occurred", ex);
-        }
     }
 
     @Override
     public void visit(BoundCheckExpr expr) {
-        try {
         if (expr.getLocation() != null) {
             pushLocation(expr.getLocation());
         }
@@ -1669,9 +1531,6 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         if (expr.getLocation() != null) {
             popLocation();
         }
-        } catch (IOException e) {
-            throw new RenderingException("IO error occurred", e);
-        }
     }
 
     private class InjectorContextImpl implements InjectorContext {
@@ -1698,12 +1557,12 @@ public class StatementRenderer implements ExprVisitor, StatementVisitor {
         }
 
         @Override
-        public void writeEscaped(String str) throws IOException {
+        public void writeEscaped(String str) {
             writer.append(RenderingUtil.escapeString(str));
         }
 
         @Override
-        public void writeType(ValueType type) throws IOException {
+        public void writeType(ValueType type) {
             context.typeToClsString(writer, type);
         }
 

core/src/main/java/org/teavm/backend/javascript/spi/Generator.java

@@ -15,10 +15,9 @@
  */
 package org.teavm.backend.javascript.spi;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.model.MethodReference;
 
 public interface Generator {
-    void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException;
+    void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef);
 }

core/src/main/java/org/teavm/backend/javascript/spi/Injector.java

@@ -15,9 +15,8 @@
  */
 package org.teavm.backend.javascript.spi;
 
-import java.io.IOException;
 import org.teavm.model.MethodReference;
 
 public interface Injector {
-    void generate(InjectorContext context, MethodReference methodRef) throws IOException;
+    void generate(InjectorContext context, MethodReference methodRef);
 }

core/src/main/java/org/teavm/backend/javascript/spi/InjectorContext.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.backend.javascript.spi;
 
-import java.io.IOException;
 import java.util.Properties;
 import org.teavm.ast.Expr;
 import org.teavm.backend.javascript.codegen.SourceWriter;
@@ -37,9 +36,9 @@ public interface InjectorContext extends ServiceRepository {
 
     Properties getProperties();
 
-    void writeEscaped(String str) throws IOException;
+    void writeEscaped(String str);
 
-    void writeType(ValueType type) throws IOException;
+    void writeType(ValueType type);
 
     void writeExpr(Expr expr);
 

core/src/main/java/org/teavm/backend/javascript/templating/JavaScriptTemplateFactory.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.backend.javascript.templating;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.ast.AstUtil;
 import org.teavm.model.ClassReaderSource;
 
@@ -28,7 +27,7 @@ public class JavaScriptTemplateFactory {
         this.classSource = classSource;
     }
 
-    public JavaScriptTemplate createFromResource(String path) throws IOException {
+    public JavaScriptTemplate createFromResource(String path) {
         return new JavaScriptTemplate(AstUtil.parseFromResources(classLoader, path), classSource);
     }
 }

core/src/main/java/org/teavm/backend/javascript/templating/SourceFragment.java

@@ -15,9 +15,8 @@
  */
 package org.teavm.backend.javascript.templating;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 
 public interface SourceFragment {
-    void write(SourceWriter writer, int precedence) throws IOException;
+    void write(SourceWriter writer, int precedence);
 }

core/src/main/java/org/teavm/backend/javascript/templating/TemplatingAstWriter.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.backend.javascript.templating;
 
-import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 import org.mozilla.javascript.ast.ElementGet;
@@ -56,7 +55,7 @@ public class TemplatingAstWriter extends AstWriter {
     }
 
     @Override
-    protected boolean intrinsic(FunctionCall node, int precedence) throws IOException {
+    protected boolean intrinsic(FunctionCall node, int precedence) {
         if (node.getTarget() instanceof Name) {
             var name = (Name) node.getTarget();
             if (scopeOfId(name.getIdentifier()) == null) {
@@ -66,7 +65,7 @@ public class TemplatingAstWriter extends AstWriter {
         return super.intrinsic(node, precedence);
     }
 
-    private boolean tryIntrinsicName(FunctionCall node, String name) throws IOException {
+    private boolean tryIntrinsicName(FunctionCall node, String name) {
         switch (name) {
             case "teavm_javaClass":
                 return writeJavaClass(node);
@@ -83,7 +82,7 @@ public class TemplatingAstWriter extends AstWriter {
         }
     }
 
-    private boolean writeJavaClass(FunctionCall node) throws IOException {
+    private boolean writeJavaClass(FunctionCall node) {
         if (node.getArguments().size() != 1) {
             return false;
         }
@@ -95,7 +94,7 @@ public class TemplatingAstWriter extends AstWriter {
         return true;
     }
 
-    private boolean writeJavaMethod(FunctionCall node) throws IOException {
+    private boolean writeJavaMethod(FunctionCall node) {
         if (node.getArguments().size() != 2) {
             return false;
         }
@@ -110,7 +109,7 @@ public class TemplatingAstWriter extends AstWriter {
         return true;
     }
 
-    private boolean writeJavaConstructor(FunctionCall node) throws IOException {
+    private boolean writeJavaConstructor(FunctionCall node) {
         if (node.getArguments().size() != 2) {
             return false;
         }
@@ -125,7 +124,7 @@ public class TemplatingAstWriter extends AstWriter {
         return true;
     }
 
-    private boolean writeJavaClassInit(FunctionCall node) throws IOException {
+    private boolean writeJavaClassInit(FunctionCall node) {
         if (node.getArguments().size() != 1) {
             return false;
         }
@@ -137,7 +136,7 @@ public class TemplatingAstWriter extends AstWriter {
         return true;
     }
 
-    private boolean writeFragment(FunctionCall node) throws IOException {
+    private boolean writeFragment(FunctionCall node) {
         if (node.getArguments().size() != 1) {
             return false;
         }
@@ -151,7 +150,7 @@ public class TemplatingAstWriter extends AstWriter {
     }
 
     @Override
-    protected void print(ElementGet node) throws IOException {
+    protected void print(ElementGet node) {
         if (node.getElement() instanceof FunctionCall) {
             var call = (FunctionCall) node.getElement();
             if (call.getTarget() instanceof Name) {
@@ -176,7 +175,7 @@ public class TemplatingAstWriter extends AstWriter {
     }
 
     @Override
-    public void print(PropertyGet node) throws IOException {
+    public void print(PropertyGet node) {
         if (node.getTarget() instanceof Name) {
             var name = (Name) node.getTarget();
             var scope = scopeOfId(name.getIdentifier());
@@ -192,7 +191,7 @@ public class TemplatingAstWriter extends AstWriter {
         super.print(node);
     }
 
-    private boolean writeJavaVirtualMethod(ElementGet get, FunctionCall call) throws IOException {
+    private boolean writeJavaVirtualMethod(ElementGet get, FunctionCall call) {
         var arg = call.getArguments().get(0);
         if (!(arg instanceof StringLiteral)) {
             return false;
@@ -203,7 +202,7 @@ public class TemplatingAstWriter extends AstWriter {
         return true;
     }
 
-    private boolean writeJavaField(ElementGet get, FunctionCall call) throws IOException {
+    private boolean writeJavaField(ElementGet get, FunctionCall call) {
         if (call.getArguments().size() != 2) {
             return false;
         }
@@ -220,7 +219,7 @@ public class TemplatingAstWriter extends AstWriter {
     }
 
     @Override
-    public void print(Name node, int precedence) throws IOException {
+    public void print(Name node, int precedence) {
         var definingScope = scopeOfId(node.getIdentifier());
         if (rootScope) {
             if (names != null && definingScope == scope) {

core/src/main/java/org/teavm/vm/spi/AbstractRendererListener.java

@@ -15,16 +15,15 @@
  */
 package org.teavm.vm.spi;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.rendering.RenderingManager;
 import org.teavm.vm.BuildTarget;
 
 public abstract class AbstractRendererListener implements RendererListener {
     @Override
-    public void begin(RenderingManager manager, BuildTarget buildTarget) throws IOException {
+    public void begin(RenderingManager manager, BuildTarget buildTarget) {
     }
 
     @Override
-    public void complete() throws IOException {
+    public void complete() {
     }
 }

core/src/main/java/org/teavm/vm/spi/RendererListener.java

@@ -15,12 +15,11 @@
  */
 package org.teavm.vm.spi;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.rendering.RenderingManager;
 import org.teavm.vm.BuildTarget;
 
 public interface RendererListener {
-    void begin(RenderingManager context, BuildTarget buildTarget) throws IOException;
+    void begin(RenderingManager context, BuildTarget buildTarget);
 
-    void complete() throws IOException;
+    void complete();
 }

jso/impl/src/main/java/org/teavm/jso/impl/JSAliasRenderer.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.jso.impl;
 
-import java.io.IOException;
 import java.util.HashMap;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.rendering.RenderingManager;
@@ -44,7 +43,7 @@ class JSAliasRenderer implements RendererListener, VirtualMethodContributor {
     }
 
     @Override
-    public void complete() throws IOException {
+    public void complete() {
         if (!hasClassesToExpose()) {
             return;
         }
@@ -178,7 +177,7 @@ class JSAliasRenderer implements RendererListener, VirtualMethodContributor {
         }
     }
 
-    private void writeFunctor(ClassReader cls, FieldReference functorField) throws IOException {
+    private void writeFunctor(ClassReader cls, FieldReference functorField) {
         AnnotationReader implAnnot = cls.getAnnotations().get(FunctorImpl.class.getName());
         MethodDescriptor functorMethod = MethodDescriptor.parse(implAnnot.getValue("value").getString());
         String alias = cls.getMethod(functorMethod).getAnnotations()
@@ -206,7 +205,7 @@ class JSAliasRenderer implements RendererListener, VirtualMethodContributor {
         writer.outdent().append("};").softNewLine();
     }
 
-    private void appendArguments(int count) throws IOException {
+    private void appendArguments(int count) {
         for (int i = 0; i < count; ++i) {
             if (i > 0) {
                 writer.append(',').ws();

jso/impl/src/main/java/org/teavm/jso/impl/JSBodyAstEmitter.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.jso.impl;
 
-import java.io.IOException;
 import org.mozilla.javascript.Node;
 import org.mozilla.javascript.ast.AstNode;
 import org.mozilla.javascript.ast.Block;
@@ -44,7 +43,7 @@ class JSBodyAstEmitter implements JSBodyEmitter {
     }
 
     @Override
-    public void emit(InjectorContext context) throws IOException {
+    public void emit(InjectorContext context) {
         var astWriter = new AstWriter(context.getWriter(), new DefaultGlobalNameWriter(context.getWriter()));
         int paramIndex = 0;
         if (!isStatic) {
@@ -148,7 +147,7 @@ class JSBodyAstEmitter implements JSBodyEmitter {
     }
 
     @Override
-    public void emit(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void emit(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         var astWriter = new AstWriter(writer, new DefaultGlobalNameWriter(writer));
         int paramIndex = 1;
         if (!isStatic) {

jso/impl/src/main/java/org/teavm/jso/impl/JSBodyBloatedEmitter.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.jso.impl;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.GeneratorContext;
 import org.teavm.backend.javascript.spi.InjectorContext;
@@ -38,7 +37,7 @@ class JSBodyBloatedEmitter implements JSBodyEmitter {
     }
 
     @Override
-    public void emit(InjectorContext context) throws IOException {
+    public void emit(InjectorContext context) {
         emit(context.getWriter(), new EmissionStrategy() {
             @Override
             public void emitArgument(int argument) {
@@ -46,28 +45,28 @@ class JSBodyBloatedEmitter implements JSBodyEmitter {
             }
 
             @Override
-            public void emitModule(String name) throws IOException {
+            public void emitModule(String name) {
                 context.getWriter().append(context.importModule(name));
             }
         });
     }
 
     @Override
-    public void emit(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void emit(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         emit(writer, new EmissionStrategy() {
             @Override
-            public void emitArgument(int argument) throws IOException {
+            public void emitArgument(int argument) {
                 writer.append(context.getParameterName(argument + 1));
             }
 
             @Override
-            public void emitModule(String name) throws IOException {
+            public void emitModule(String name) {
                 writer.append(context.importModule(name));
             }
         });
     }
 
-    private void emit(SourceWriter writer, EmissionStrategy strategy) throws IOException {
+    private void emit(SourceWriter writer, EmissionStrategy strategy) {
         int bodyParamCount = isStatic ? method.parameterCount() : method.parameterCount() - 1;
 
         writer.append("if (!").appendMethodBody(method).append(".$native)").ws().append('{').indent().newLine();
@@ -151,8 +150,8 @@ class JSBodyBloatedEmitter implements JSBodyEmitter {
     }
 
     interface EmissionStrategy {
-        void emitArgument(int argument) throws IOException;
+        void emitArgument(int argument);
 
-        void emitModule(String name) throws IOException;
+        void emitModule(String name);
     }
 }

jso/impl/src/main/java/org/teavm/jso/impl/JSBodyEmitter.java

@@ -15,14 +15,13 @@
  */
 package org.teavm.jso.impl;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.GeneratorContext;
 import org.teavm.backend.javascript.spi.InjectorContext;
 import org.teavm.model.MethodReference;
 
 interface JSBodyEmitter {
-    void emit(InjectorContext context) throws IOException;
+    void emit(InjectorContext context);
 
-    void emit(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException;
+    void emit(GeneratorContext context, SourceWriter writer, MethodReference methodRef);
 }

jso/impl/src/main/java/org/teavm/jso/impl/JSBodyGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.jso.impl;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -25,14 +24,14 @@ import org.teavm.model.MethodReference;
 
 public class JSBodyGenerator implements Injector, Generator {
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         JSBodyRepository emitterRepository = context.getService(JSBodyRepository.class);
         JSBodyEmitter emitter = emitterRepository.emitters.get(methodRef);
         emitter.emit(context);
     }
 
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         JSBodyRepository emitterRepository = context.getService(JSBodyRepository.class);
         JSBodyEmitter emitter = emitterRepository.emitters.get(methodRef);
         emitter.emit(context, writer, methodRef);

jso/impl/src/main/java/org/teavm/jso/impl/JSExceptionsGenerator.java

@@ -15,14 +15,13 @@
  */
 package org.teavm.jso.impl;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.spi.Injector;
 import org.teavm.backend.javascript.spi.InjectorContext;
 import org.teavm.model.MethodReference;
 
 public class JSExceptionsGenerator implements Injector {
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "getJavaException":
                 context.getWriter().appendFunction("$rt_javaException").append("(");

jso/impl/src/main/java/org/teavm/jso/impl/JSNativeGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.jso.impl;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -26,13 +25,12 @@ import org.teavm.model.MethodReference;
 public class JSNativeGenerator implements Generator {
     private JavaScriptTemplate template;
 
-    public JSNativeGenerator(JavaScriptTemplateFactory templateFactory) throws IOException {
+    public JSNativeGenerator(JavaScriptTemplateFactory templateFactory) {
         template = templateFactory.createFromResource("org/teavm/jso/impl/JS.js");
     }
 
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef)
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
-            throws IOException {
         switch (methodRef.getName()) {
             case "function":
                 template.builder("jsFunction").withContext(context).build().write(writer, 0);

jso/impl/src/main/java/org/teavm/jso/impl/JSNativeInjector.java

@@ -16,7 +16,6 @@
 package org.teavm.jso.impl;
 
 import static org.teavm.backend.javascript.rendering.RenderingUtil.escapeString;
-import java.io.IOException;
 import java.util.HashSet;
 import java.util.Set;
 import org.teavm.ast.ConstantExpr;
@@ -41,7 +40,7 @@ public class JSNativeInjector implements Injector, DependencyPlugin {
     private Set<DependencyNode> functorParamNodes = new HashSet<>();
 
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         SourceWriter writer = context.getWriter();
         switch (methodRef.getName()) {
             case "arrayData":
@@ -162,7 +161,7 @@ public class JSNativeInjector implements Injector, DependencyPlugin {
         }
     }
 
-    private void dataToArray(InjectorContext context, String className) throws IOException {
+    private void dataToArray(InjectorContext context, String className) {
         var writer = context.getWriter();
         writer.appendFunction("$rt_wrapArray").append("(").appendFunction(className).append(",").ws();
         context.writeExpr(context.getArgument(0), Precedence.min());
@@ -229,7 +228,7 @@ public class JSNativeInjector implements Injector, DependencyPlugin {
     }
 
 
-    private void renderProperty(Expr property, InjectorContext context) throws IOException {
+    private void renderProperty(Expr property, InjectorContext context) {
         SourceWriter writer = context.getWriter();
         String name = extractPropertyName(property);
         if (name == null) {

jso/impl/src/main/java/org/teavm/jso/impl/JSWrapperGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.jso.impl;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.rendering.Precedence;
 import org.teavm.backend.javascript.spi.Injector;
 import org.teavm.backend.javascript.spi.InjectorContext;
@@ -29,7 +28,7 @@ public class JSWrapperGenerator implements Injector, DependencyPlugin {
     private DependencyNode externalClassesNode;
 
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "directJavaToJs":
             case "directJsToJava":

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

@@ -15,7 +15,6 @@
  */
 package org.teavm.platform.plugin;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -41,7 +40,7 @@ public class AsyncMethodGenerator implements Generator, DependencyPlugin, Virtua
     private JavaScriptTemplate template;
 
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         if (template == null) {
             var templateFactory = new JavaScriptTemplateFactory(context.getClassLoader(), context.getClassSource());
             template = templateFactory.createFromResource("org/teavm/platform/plugin/Async.js");

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

@@ -15,7 +15,6 @@
  */
 package org.teavm.platform.plugin;
 
-import java.io.IOException;
 import java.util.ArrayList;
 import java.util.List;
 import org.teavm.backend.javascript.codegen.SourceWriter;
@@ -41,7 +40,7 @@ class BuildTimeResourceArray<T extends Resource> implements ResourceArray<T>, Re
     }
 
     @Override
-    public void write(SourceWriter writer) throws IOException {
+    public void write(SourceWriter writer) {
         writer.append('[').tokenBoundary();
         for (int i = 0; i < data.size(); ++i) {
             if (i > 0) {

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

@@ -15,7 +15,6 @@
  */
 package org.teavm.platform.plugin;
 
-import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;
 import org.teavm.backend.javascript.codegen.SourceWriter;
@@ -42,7 +41,7 @@ class BuildTimeResourceMap<T extends Resource> implements ResourceMap<T>, Resour
     }
 
     @Override
-    public void write(SourceWriter writer) throws IOException {
+    public void write(SourceWriter writer) {
         writer.append('{');
         boolean first = true;
         for (Map.Entry<String, T> entry : data.entrySet()) {

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

@@ -15,7 +15,6 @@
  */
 package org.teavm.platform.plugin;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.model.FieldReference;
 import org.teavm.platform.metadata.StaticFieldResource;
@@ -32,7 +31,7 @@ class BuildTimeStaticFieldResource implements StaticFieldResource, ResourceWrite
     }
 
     @Override
-    public void write(SourceWriter writer) throws IOException {
+    public void write(SourceWriter writer) {
         writer.appendField(field);
     }
 }

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

@@ -15,7 +15,6 @@
  */
 package org.teavm.platform.plugin;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -33,7 +32,7 @@ class MetadataProviderNativeGenerator implements Generator {
     }
 
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         DefaultMetadataGeneratorContext metadataContext = new DefaultMetadataGeneratorContext(context.getClassSource(),
                 context.getClassLoader(), context.getProperties(), context);
 

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

@@ -15,7 +15,6 @@
  */
 package org.teavm.platform.plugin;
 
-import java.io.IOException;
 import java.lang.annotation.Annotation;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
@@ -75,7 +74,7 @@ public class PlatformGenerator implements Generator, Injector, DependencyPlugin
     }
 
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "asJavaClass":
             case "classFromResource":
@@ -92,7 +91,7 @@ public class PlatformGenerator implements Generator, Injector, DependencyPlugin
     }
 
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "prepareNewInstance":
                 generatePrepareNewInstance(context, writer);
@@ -112,8 +111,7 @@ public class PlatformGenerator implements Generator, Injector, DependencyPlugin
         }
     }
 
-    private void generateWithTemplate(GeneratorContext context, SourceWriter writer, MethodReference methodRef)
+    private void generateWithTemplate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
-            throws IOException {
         if (template == null) {
             template = new JavaScriptTemplateFactory(context.getClassLoader(), context.getClassSource())
                     .createFromResource("org/teavm/platform/plugin/Platform.js");
@@ -121,7 +119,7 @@ public class PlatformGenerator implements Generator, Injector, DependencyPlugin
         template.builder(methodRef.getName()).withContext(context).build().write(writer, 0);
     }
 
-    private void generatePrepareNewInstance(GeneratorContext context, SourceWriter writer) throws IOException {
+    private void generatePrepareNewInstance(GeneratorContext context, SourceWriter writer) {
         MethodDependencyInfo newInstanceMethod = context.getDependency().getMethod(
                 new MethodReference(Platform.class, "newInstanceImpl", PlatformClass.class, Object.class));
         writer.append("let c").ws().append("=").ws().append("'$$constructor$$';").softNewLine();
@@ -140,7 +138,7 @@ public class PlatformGenerator implements Generator, Injector, DependencyPlugin
         }
     }
 
-    private void generateLookup(GeneratorContext context, SourceWriter writer) throws IOException {
+    private void generateLookup(GeneratorContext context, SourceWriter writer) {
         String param = context.getParameterName(1);
         writer.append("switch").ws().append("(").appendFunction("$rt_ustr").append("(" + param + "))")
                 .ws().append("{").softNewLine().indent();
@@ -153,7 +151,7 @@ public class PlatformGenerator implements Generator, Injector, DependencyPlugin
     }
 
 
-    private void generateEnumConstants(GeneratorContext context, SourceWriter writer) throws IOException {
+    private void generateEnumConstants(GeneratorContext context, SourceWriter writer) {
         writer.append("let c").ws().append("=").ws().append("'$$enumConstants$$';").softNewLine();
         for (String clsName : context.getClassSource().getClassNames()) {
             ClassReader cls = context.getClassSource().get(clsName);
@@ -184,7 +182,7 @@ public class PlatformGenerator implements Generator, Injector, DependencyPlugin
                 .append(");").softNewLine();
     }
 
-    private void generateAnnotations(GeneratorContext context, SourceWriter writer) throws IOException {
+    private void generateAnnotations(GeneratorContext context, SourceWriter writer) {
         writer.append("let c").ws().append("=").ws().append("'$$annotations$$';").softNewLine();
         for (String clsName : context.getClassSource().getClassNames()) {
             ClassReader annotCls = context.getClassSource().get(clsName + "$$__annotations__$$");

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

@@ -15,7 +15,6 @@
  */
 package org.teavm.platform.plugin;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.spi.Injector;
 import org.teavm.backend.javascript.spi.InjectorContext;
 import org.teavm.dependency.DependencyAgent;
@@ -34,7 +33,7 @@ public class PlatformQueueGenerator implements Injector, DependencyPlugin {
     }
 
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         context.writeExpr(context.getArgument(0));
     }
 }

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

@@ -15,7 +15,6 @@
  */
 package org.teavm.platform.plugin;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.spi.Generator;
 import org.teavm.backend.javascript.spi.GeneratorContext;
@@ -23,7 +22,7 @@ import org.teavm.model.MethodReference;
 
 class ResourceAccessorGenerator implements Generator {
     @Override
-    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) throws IOException {
+    public void generate(GeneratorContext context, SourceWriter writer, MethodReference methodRef) {
         writer.append("let result").ws().append("=").ws().append("[];").softNewLine();
         writer.append("for").ws().append("(let key in ").append(context.getParameterName(1)).append(")").ws()
                 .append("{").indent().softNewLine();

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

@@ -15,7 +15,6 @@
  */
 package org.teavm.platform.plugin;
 
-import java.io.IOException;
 import org.teavm.ast.ConstantExpr;
 import org.teavm.ast.Expr;
 import org.teavm.backend.javascript.spi.Injector;
@@ -25,7 +24,7 @@ import org.teavm.model.ValueType;
 
 class ResourceAccessorInjector implements Injector {
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         switch (methodRef.getName()) {
             case "get":
             case "getProperty":
@@ -102,7 +101,7 @@ class ResourceAccessorInjector implements Injector {
         }
     }
 
-    private void writePropertyAccessor(InjectorContext context, Expr property) throws IOException {
+    private void writePropertyAccessor(InjectorContext context, Expr property) {
         if (property instanceof ConstantExpr) {
             String str = (String) ((ConstantExpr) property).getValue();
             if (str.isEmpty()) {
@@ -119,7 +118,7 @@ class ResourceAccessorInjector implements Injector {
         context.getWriter().append(")]");
     }
 
-    private void writeStringExpr(InjectorContext context, Expr expr) throws IOException {
+    private void writeStringExpr(InjectorContext context, Expr expr) {
         if (expr instanceof ConstantExpr) {
             String str = (String) ((ConstantExpr) expr).getValue();
             context.getWriter().append('"');

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

@@ -15,9 +15,8 @@
  */
 package org.teavm.platform.plugin;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 
 public interface ResourceWriter {
-    void write(SourceWriter writer) throws IOException;
+    void write(SourceWriter writer);
 }

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

@@ -23,7 +23,7 @@ final class ResourceWriterHelper {
     private ResourceWriterHelper() {
     }
 
-    public static void write(SourceWriter writer, Object resource) throws IOException {
+    public static void write(SourceWriter writer, Object resource) {
         if (resource == null) {
             writer.append("null");
         } else {

tests/src/test/java/org/teavm/incremental/EntryPointGenerator.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.incremental;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.spi.Injector;
 import org.teavm.backend.javascript.spi.InjectorContext;
 import org.teavm.model.FieldReference;
@@ -23,7 +22,7 @@ import org.teavm.model.MethodReference;
 
 public class EntryPointGenerator implements Injector {
     @Override
-    public void generate(InjectorContext context, MethodReference methodRef) throws IOException {
+    public void generate(InjectorContext context, MethodReference methodRef) {
         context.getWriter().append("main.result = (");
         context.writeExpr(context.getArgument(0));
         context.getWriter().append(").").appendField(new FieldReference("java.lang.String", "nativeString"));

tools/junit/src/main/java/org/teavm/junit/TestExceptionPlugin.java

@@ -15,7 +15,6 @@
  */
 package org.teavm.junit;
 
-import java.io.IOException;
 import org.teavm.backend.javascript.TeaVMJavaScriptHost;
 import org.teavm.backend.javascript.codegen.SourceWriter;
 import org.teavm.backend.javascript.rendering.RenderingManager;
@@ -51,18 +50,18 @@ class TestExceptionPlugin implements TeaVMPlugin {
             RenderingManager manager;
 
             @Override
-            public void begin(RenderingManager manager, BuildTarget buildTarget) throws IOException {
+            public void begin(RenderingManager manager, BuildTarget buildTarget) {
                 this.manager = manager;
             }
 
             @Override
-            public void complete() throws IOException {
+            public void complete() {
                 renderExceptionMessage(manager.getWriter());
             }
         });
     }
 
-    private void renderExceptionMessage(SourceWriter writer) throws IOException {
+    private void renderExceptionMessage(SourceWriter writer) {
         writer.appendClass("java.lang.Throwable").append(".prototype.getMessage").ws().append("=").ws()
                 .append("function()").ws().append("{").indent().softNewLine();
         writer.append("return ").appendFunction("$rt_ustr").append("(this.")