Replace ArrayList with array to store arguments of InvokeInstruction

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

@@ -531,7 +531,7 @@ public class JavaScriptTarget implements TeaVMTarget, TeaVMJavaScriptHost {
         initExceptionInsn.setInstance(exceptionVar);
         initExceptionInsn.setMethod(new MethodReference(NoSuchMethodError.class, "<init>", String.class, void.class));
         initExceptionInsn.setType(InvocationType.SPECIAL);
-        initExceptionInsn.getArguments().add(constVar);
+        initExceptionInsn.setArguments(constVar);
         block.add(initExceptionInsn);
 
         RaiseInstruction raiseInsn = new RaiseInstruction();

core/src/main/java/org/teavm/cache/ProgramIO.java

@@ -1039,9 +1039,11 @@ public class ProgramIO {
                 MethodDescriptor methodDesc = parseMethodDescriptor(symbolTable.at(input.readInt()));
                 insn.setMethod(createMethodReference(className, methodDesc));
                 int paramCount = insn.getMethod().getDescriptor().parameterCount();
+                Variable[] arguments = new Variable[paramCount];
                 for (int i = 0; i < paramCount; ++i) {
-                    insn.getArguments().add(program.variableAt(input.readShort()));
+                    arguments[i] = program.variableAt(input.readShort());
                 }
+                insn.setArguments(arguments);
                 return insn;
             }
             case 34: {
@@ -1054,9 +1056,11 @@ public class ProgramIO {
                 MethodDescriptor methodDesc = parseMethodDescriptor(symbolTable.at(input.readInt()));
                 insn.setMethod(createMethodReference(className, methodDesc));
                 int paramCount = insn.getMethod().getDescriptor().parameterCount();
+                Variable[] arguments = new Variable[paramCount];
                 for (int i = 0; i < paramCount; ++i) {
-                    insn.getArguments().add(program.variableAt(input.readShort()));
+                    arguments[i] = program.variableAt(input.readShort());
                 }
+                insn.setArguments(arguments);
                 return insn;
             }
             case 35: {
@@ -1069,9 +1073,11 @@ public class ProgramIO {
                 MethodDescriptor methodDesc = parseMethodDescriptor(symbolTable.at(input.readInt()));
                 insn.setMethod(createMethodReference(className, methodDesc));
                 int paramCount = insn.getMethod().getDescriptor().parameterCount();
+                Variable[] arguments = new Variable[paramCount];
                 for (int i = 0; i < paramCount; ++i) {
-                    insn.getArguments().add(program.variableAt(input.readShort()));
+                    arguments[i] = program.variableAt(input.readShort());
                 }
+                insn.setArguments(arguments);
                 return insn;
             }
             case 36: {

core/src/main/java/org/teavm/model/InstructionReadVisitor.java

@@ -179,8 +179,7 @@ public class InstructionReadVisitor implements InstructionVisitor {
 
     @Override
     public void visit(InvokeInstruction insn) {
-        reader.invoke(insn.getReceiver(), insn.getInstance(), insn.getMethod(),
+        reader.invoke(insn.getReceiver(), insn.getInstance(), insn.getMethod(), insn.getArguments(), insn.getType());
-                Collections.unmodifiableList(insn.getArguments()), insn.getType());
     }
 
     @Override

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

@@ -236,9 +236,12 @@ public final class ProgramEmitter {
         insn.setType(InvocationType.SPECIAL);
         insn.setMethod(method);
         insn.setReceiver(result);
-        for (ValueEmitter arg : arguments) {
+        Variable[] insnArguments = new Variable[arguments.length];
-            insn.getArguments().add(arg.variable);
+        for (int i = 0; i < insnArguments.length; ++i) {
+            insnArguments[i] = arguments[i].variable;
         }
+        insn.setArguments(insnArguments);
+
         addInstruction(insn);
         return result != null ? var(result, method.getReturnType()) : null;
     }
@@ -260,9 +263,11 @@ public final class ProgramEmitter {
         insn.setType(InvocationType.SPECIAL);
         insn.setMethod(method);
         insn.setReceiver(result);
-        for (ValueEmitter arg : arguments) {
+        Variable[] insnArguments = new Variable[arguments.length];
-            insn.getArguments().add(arg.variable);
+        for (int i = 0; i < insnArguments.length; ++i) {
+            insnArguments[i] = arguments[i].variable;
         }
+        insn.setArguments(insnArguments);
         addInstruction(insn);
         return result != null ? var(result, resultType) : null;
     }

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

@@ -445,9 +445,11 @@ public class ValueEmitter {
         insn.setMethod(method);
         insn.setInstance(variable);
         insn.setReceiver(result);
-        for (ValueEmitter arg : arguments) {
+        Variable[] insnArguments = new Variable[arguments.length];
-            insn.getArguments().add(arg.variable);
+        for (int i = 0; i < insnArguments.length; ++i) {
+            insnArguments[i] = arguments[i].variable;
         }
+        insn.setArguments(insnArguments);
         pe.addInstruction(insn);
         return result != null ? pe.var(result, method.getReturnType()) : null;
     }
@@ -474,9 +476,11 @@ public class ValueEmitter {
         insn.setMethod(method);
         insn.setInstance(variable);
         insn.setReceiver(result);
-        for (ValueEmitter arg : arguments) {
+        Variable[] insnArguments = new Variable[arguments.length];
-            insn.getArguments().add(arg.variable);
+        for (int i = 0; i < insnArguments.length; ++i) {
+            insnArguments[i] = arguments[i].variable;
         }
+        insn.setArguments(insnArguments);
         pe.addInstruction(insn);
         return result != null ? pe.var(result, resultType) : null;
     }

core/src/main/java/org/teavm/model/instructions/InvokeInstruction.java

@@ -15,8 +15,10 @@
  */
 package org.teavm.model.instructions;
 
+import java.util.AbstractList;
 import java.util.ArrayList;
 import java.util.List;
+import java.util.function.UnaryOperator;
 import org.teavm.model.Instruction;
 import org.teavm.model.MethodReference;
 import org.teavm.model.Variable;
@@ -25,7 +27,7 @@ public class InvokeInstruction extends Instruction {
     private InvocationType type;
     private MethodReference method;
     private Variable instance;
-    private List<Variable> arguments = new ArrayList<>(1);
+    private Variable[] arguments;
     private Variable receiver;
 
     public InvocationType getType() {
@@ -44,8 +46,20 @@ public class InvokeInstruction extends Instruction {
         this.instance = instance;
     }
 
-    public List<Variable> getArguments() {
+    public List<? extends Variable> getArguments() {
-        return arguments;
+        return argumentList;
+    }
+
+    public void replaceArguments(UnaryOperator<Variable> f) {
+        if (arguments != null) {
+            for (int i = 0; i < arguments.length; ++i) {
+                arguments[i] = f.apply(arguments[i]);
+            }
+        }
+    }
+
+    public void setArguments(Variable... arguments) {
+        this.arguments = arguments.length > 0 ? arguments.clone() : null;
     }
 
     public MethodReference getMethod() {
@@ -68,4 +82,19 @@ public class InvokeInstruction extends Instruction {
     public void acceptVisitor(InstructionVisitor visitor) {
         visitor.visit(this);
     }
+
+    private List<? extends Variable> argumentList = new AbstractList<Variable>() {
+        @Override
+        public Variable get(int index) {
+            if (arguments == null) {
+                throw new IndexOutOfBoundsException();
+            }
+            return arguments[index];
+        }
+
+        @Override
+        public int size() {
+            return arguments != null ? arguments.length : 0;
+        }
+    };
 }

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

@@ -95,7 +95,7 @@ public class ClassInitializerTransformer {
         InvokeInstruction checkInitialized = new InvokeInstruction();
         checkInitialized.setType(InvocationType.SPECIAL);
         checkInitialized.setMethod(new MethodReference(Allocator.class, "isInitialized", Class.class, boolean.class));
-        checkInitialized.getArguments().add(clsVariable);
+        checkInitialized.setArguments(clsVariable);
         checkInitialized.setReceiver(initializedVariable);
         block.add(checkInitialized);
 

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

@@ -185,7 +185,7 @@ public class ExceptionHandlingShadowStackContributor {
                     raise.setMethod(new MethodReference(ExceptionHandling.class, "throwException", Throwable.class,
                             void.class));
                     raise.setType(InvocationType.SPECIAL);
-                    raise.getArguments().add(((RaiseInstruction) insn).getException());
+                    raise.setArguments(((RaiseInstruction) insn).getException());
                     raise.setLocation(insn.getLocation());
                     insn.replace(raise);
                     insn = raise;
@@ -300,7 +300,7 @@ public class ExceptionHandlingShadowStackContributor {
         InvokeInstruction registerInsn = new InvokeInstruction();
         registerInsn.setMethod(new MethodReference(ShadowStack.class, "registerCallSite", int.class, void.class));
         registerInsn.setType(InvocationType.SPECIAL);
-        registerInsn.getArguments().add(idVariable);
+        registerInsn.setArguments(idVariable);
         instructions.add(registerInsn);
 
         return instructions;

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

@@ -374,18 +374,20 @@ public class GCShadowStackContributor {
             slotConstant.setLocation(callInstruction.getLocation());
             instructionsToAdd.add(slotConstant);
 
+            List<Variable> arguments = new ArrayList<>();
             InvokeInstruction registerInvocation = new InvokeInstruction();
             registerInvocation.setLocation(callInstruction.getLocation());
             registerInvocation.setType(InvocationType.SPECIAL);
-            registerInvocation.getArguments().add(slotVar);
+            arguments.add(slotVar);
             if (var >= 0) {
                 registerInvocation.setMethod(new MethodReference(ShadowStack.class, "registerGCRoot", int.class,
                         Object.class, void.class));
-                registerInvocation.getArguments().add(program.variableAt(var));
+                arguments.add(program.variableAt(var));
             } else {
                 registerInvocation.setMethod(new MethodReference(ShadowStack.class, "removeGCRoot", int.class,
                         void.class));
             }
+            registerInvocation.setArguments(arguments.toArray(new Variable[0]));
             instructionsToAdd.add(registerInvocation);
         }
 

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

@@ -74,7 +74,7 @@ public class ShadowStackTransformer {
         InvokeInstruction invocation = new InvokeInstruction();
         invocation.setType(InvocationType.SPECIAL);
         invocation.setMethod(new MethodReference(ShadowStack.class, "allocStack", int.class, void.class));
-        invocation.getArguments().add(sizeVariable);
+        invocation.setArguments(sizeVariable);
         instructionsToAdd.add(invocation);
 
         block.addFirstAll(instructionsToAdd);
@@ -139,7 +139,7 @@ public class ShadowStackTransformer {
         InvokeInstruction invocation = new InvokeInstruction();
         invocation.setType(InvocationType.SPECIAL);
         invocation.setMethod(new MethodReference(ShadowStack.class, "releaseStack", int.class, void.class));
-        invocation.getArguments().add(sizeVariable);
+        invocation.setArguments(sizeVariable);
         instructionsToAdd.add(invocation);
 
         exitBlock.getLastInstruction().insertPreviousAll(instructionsToAdd);

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

@@ -727,7 +727,7 @@ public class GlobalValueNumbering implements MethodOptimization {
                 int instance = map[insn.getInstance().getIndex()];
                 insn.setInstance(program.variableAt(instance));
             }
-            insn.getArguments().replaceAll(mapper);
+            insn.replaceArguments(mapper);
         }
 
         @Override

core/src/main/java/org/teavm/model/text/ListingParser.java

@@ -713,9 +713,9 @@ public class ListingParser {
                         lexer.getIndex());
             }
             insn.setInstance(arguments.get(0));
-            insn.getArguments().addAll(arguments.subList(1, arguments.size()));
+            insn.setArguments(arguments.subList(1, arguments.size()).toArray(new Variable[0]));
         } else {
-            insn.getArguments().addAll(arguments);
+            insn.setArguments(arguments.toArray(new Variable[0]));
         }
 
         addInstruction(insn);

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

@@ -411,9 +411,11 @@ public class InstructionCopyReader implements InstructionReader {
         insnCopy.setType(type);
         insnCopy.setInstance(instance != null ? copyVar(instance) : null);
         insnCopy.setReceiver(receiver != null ? copyVar(receiver) : null);
-        for (VariableReader arg : arguments) {
+        Variable[] argsCopy = new Variable[arguments.size()];
-            insnCopy.getArguments().add(copyVar(arg));
+        for (int i = 0; i < argsCopy.length; ++i) {
+            argsCopy[i] = copyVar(arguments.get(i));
         }
+        insnCopy.setArguments(argsCopy);
         copy = insnCopy;
         copy.setLocation(location);
     }

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

@@ -267,9 +267,7 @@ public class InstructionVariableMapper extends AbstractInstructionVisitor {
         if (insn.getInstance() != null) {
             insn.setInstance(map(insn.getInstance()));
         }
-        for (int i = 0; i < insn.getArguments().size(); ++i) {
+        insn.replaceArguments(this::map);
-            insn.getArguments().set(i, map(insn.getArguments().get(i)));
-        }
     }
 
     @Override

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

@@ -117,7 +117,7 @@ public class MissingItemsProcessor {
         initExceptionInsn.setMethod(new MethodReference(exceptionName, "<init>", ValueType.object("java.lang.String"),
                 ValueType.VOID));
         initExceptionInsn.setType(InvocationType.SPECIAL);
-        initExceptionInsn.getArguments().add(constVar);
+        initExceptionInsn.setArguments(constVar);
         initExceptionInsn.setLocation(location);
         instructionsToAdd.add(initExceptionInsn);
 

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

@@ -686,10 +686,7 @@ public class PhiUpdater {
 
         @Override
         public void visit(InvokeInstruction insn) {
-            List<Variable> args = insn.getArguments();
+            insn.replaceArguments(v -> use(v));
-            for (int i = 0; i < args.size(); ++i) {
-                args.set(i, use(args.get(i)));
-            }
             if (insn.getInstance() != null) {
                 insn.setInstance(use(insn.getInstance()));
             }

core/src/main/java/org/teavm/parsing/ProgramParser.java

@@ -657,7 +657,7 @@ public class ProgramParser {
                         if (result >= 0) {
                             insn.setReceiver(getVariable(result));
                         }
-                        insn.getArguments().addAll(Arrays.asList(args));
+                        insn.setArguments(args);
                         addInstruction(insn);
                     } else {
                         InvokeInstruction insn = new InvokeInstruction();
@@ -671,7 +671,7 @@ public class ProgramParser {
                             insn.setReceiver(getVariable(result));
                         }
                         insn.setInstance(getVariable(instance));
-                        insn.getArguments().addAll(Arrays.asList(args));
+                        insn.setArguments(args);
                         addInstruction(insn);
                     }
                     break;

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

@@ -329,7 +329,12 @@ class JSClassProcessor {
             if (method.getProgram() != null && method.getProgram().basicBlockCount() > 0) {
                 invoke.setMethod(new MethodReference(method.getOwnerName(), method.getName() + "$static",
                         getStaticSignature(method.getReference())));
-                invoke.getArguments().add(0, invoke.getInstance());
+                Variable[] newArguments = new Variable[invoke.getArguments().size() + 1];
+                newArguments[0] = invoke.getInstance();
+                for (int i = 0; i < invoke.getArguments().size(); ++i) {
+                    newArguments[i + 1] = invoke.getArguments().get(i);
+                }
+                invoke.setArguments(newArguments);
                 invoke.setInstance(null);
             }
             invoke.setType(InvocationType.SPECIAL);
@@ -369,16 +374,18 @@ class JSClassProcessor {
         newInvoke.setType(InvocationType.SPECIAL);
         newInvoke.setReceiver(result);
         newInvoke.setLocation(invoke.getLocation());
+        List<Variable> newArgs = new ArrayList<>();
         if (invoke.getInstance() != null) {
             Variable arg = marshaller.wrapArgument(callLocation, invoke.getInstance(),
                     ValueType.object(method.getOwnerName()), false);
-            newInvoke.getArguments().add(arg);
+            newArgs.add(arg);
         }
         for (int i = 0; i < invoke.getArguments().size(); ++i) {
             Variable arg = marshaller.wrapArgument(callLocation, invoke.getArguments().get(i),
                     method.parameterType(i), byRefParams[i]);
-            newInvoke.getArguments().add(arg);
+            newArgs.add(arg);
         }
+        newInvoke.setArguments(newArgs.toArray(new Variable[0]));
         replacement.add(newInvoke);
         if (result != null) {
             result = marshaller.unwrapReturnValue(callLocation, result, method.getResultType());
@@ -501,15 +508,17 @@ class JSClassProcessor {
         newInvoke.setMethod(JSMethods.invoke(method.parameterCount()));
         newInvoke.setType(InvocationType.SPECIAL);
         newInvoke.setReceiver(result);
-        newInvoke.getArguments().add(invoke.getInstance());
+        List<Variable> newArguments = new ArrayList<>();
-        newInvoke.getArguments().add(marshaller.addStringWrap(marshaller.addString(name, invoke.getLocation()),
+        newArguments.add(invoke.getInstance());
+        newArguments.add(marshaller.addStringWrap(marshaller.addString(name, invoke.getLocation()),
                 invoke.getLocation()));
         newInvoke.setLocation(invoke.getLocation());
         for (int i = 0; i < invoke.getArguments().size(); ++i) {
             Variable arg = marshaller.wrapArgument(callLocation, invoke.getArguments().get(i),
                     method.parameterType(i), byRefParams[i]);
-            newInvoke.getArguments().add(arg);
+            newArguments.add(arg);
         }
+        newInvoke.setArguments(newArguments.toArray(new Variable[0]));
         replacement.add(newInvoke);
         if (result != null) {
             result = marshaller.unwrapReturnValue(callLocation, result, method.getResultType());
@@ -661,10 +670,12 @@ class JSClassProcessor {
             insn.setInstance(marshaller.unwrapReturnValue(location, program.variableAt(paramIndex++),
                     ValueType.object(calleeRef.getClassName())));
         }
+        Variable[] args = new Variable[callee.parameterCount()];
         for (int i = 0; i < callee.parameterCount(); ++i) {
-            insn.getArguments().add(marshaller.unwrapReturnValue(location, program.variableAt(paramIndex++),
+            args[i] = marshaller.unwrapReturnValue(location, program.variableAt(paramIndex++),
-                    callee.parameterType(i)));
+                    callee.parameterType(i));
         }
+        insn.setArguments(args);
         if (callee.getResultType() != ValueType.VOID) {
             insn.setReceiver(program.createVariable());
         }
@@ -691,8 +702,7 @@ class JSClassProcessor {
         insn.setType(InvocationType.SPECIAL);
         insn.setMethod(JSMethods.GET);
         insn.setReceiver(receiver);
-        insn.getArguments().add(instance);
+        insn.setArguments(instance, nameVar);
-        insn.getArguments().add(nameVar);
         insn.setLocation(location);
         replacement.add(insn);
     }
@@ -702,9 +712,7 @@ class JSClassProcessor {
         InvokeInstruction insn = new InvokeInstruction();
         insn.setType(InvocationType.SPECIAL);
         insn.setMethod(JSMethods.SET);
-        insn.getArguments().add(instance);
+        insn.setArguments(instance, nameVar, value);
-        insn.getArguments().add(nameVar);
-        insn.getArguments().add(value);
         insn.setLocation(location);
         replacement.add(insn);
     }
@@ -714,8 +722,7 @@ class JSClassProcessor {
         insn.setType(InvocationType.SPECIAL);
         insn.setMethod(JSMethods.GET);
         insn.setReceiver(receiver);
-        insn.getArguments().add(array);
+        insn.setArguments(array, index);
-        insn.getArguments().add(index);
         insn.setLocation(location);
         replacement.add(insn);
     }
@@ -724,9 +731,7 @@ class JSClassProcessor {
         InvokeInstruction insn = new InvokeInstruction();
         insn.setType(InvocationType.SPECIAL);
         insn.setMethod(JSMethods.SET);
-        insn.getArguments().add(array);
+        insn.setArguments(array, index, value);
-        insn.getArguments().add(index);
-        insn.getArguments().add(value);
         insn.setLocation(location);
         replacement.add(insn);
     }

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

@@ -125,15 +125,14 @@ class JSObjectClassTransformer implements ClassHolderTransformer {
             JSValueMarshaller marshaller = new JSValueMarshaller(diagnostics, typeHelper, hierarchy.getClassSource(),
                     program, marshallInstructions);
 
-            List<Variable> variablesToPass = new ArrayList<>();
+            Variable[] variablesToPass = new Variable[method.parameterCount()];
             for (int i = 0; i < method.parameterCount(); ++i) {
-                variablesToPass.add(program.createVariable());
+                variablesToPass[i] = program.createVariable();
             }
 
             for (int i = 0; i < method.parameterCount(); ++i) {
-                Variable var = marshaller.unwrapReturnValue(callLocation, variablesToPass.get(i),
+                variablesToPass[i] = marshaller.unwrapReturnValue(callLocation, variablesToPass[i],
                         method.parameterType(i));
-                variablesToPass.set(i, var);
             }
 
             basicBlock.addAll(marshallInstructions);
@@ -143,7 +142,7 @@ class JSObjectClassTransformer implements ClassHolderTransformer {
             invocation.setType(InvocationType.VIRTUAL);
             invocation.setInstance(program.variableAt(0));
             invocation.setMethod(methodRef);
-            invocation.getArguments().addAll(variablesToPass);
+            invocation.setArguments(variablesToPass);
             basicBlock.add(invocation);
 
             ExitInstruction exit = new ExitInstruction();

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

@@ -15,6 +15,7 @@
  */
 package org.teavm.jso.impl;
 
+import java.util.ArrayList;
 import java.util.List;
 import java.util.function.Function;
 import org.teavm.diagnostics.Diagnostics;
@@ -90,8 +91,7 @@ class JSValueMarshaller {
         insn.setType(InvocationType.SPECIAL);
         insn.setMethod(JSMethods.FUNCTION);
         insn.setReceiver(functor);
-        insn.getArguments().add(var);
+        insn.setArguments(var, nameVar);
-        insn.getArguments().add(nameVar);
         insn.setLocation(location.getSourceLocation());
         replacement.add(insn);
         return functor;
@@ -103,7 +103,7 @@ class JSValueMarshaller {
             insn.setMethod(JSMethods.ARRAY_DATA);
             insn.setReceiver(program.createVariable());
             insn.setType(InvocationType.SPECIAL);
-            insn.getArguments().add(var);
+            insn.setArguments(var);
             replacement.add(insn);
             return insn.getReceiver();
         }
@@ -127,7 +127,7 @@ class JSValueMarshaller {
             InvokeInstruction insn = new InvokeInstruction();
             insn.setMethod(referenceCache.getCached(new MethodReference(JS.class.getName(), "wrap",
                     getWrappedType(type), getWrapperType(type))));
-            insn.getArguments().add(var);
+            insn.setArguments(var);
             insn.setReceiver(result);
             insn.setType(InvocationType.SPECIAL);
             insn.setLocation(location);
@@ -145,7 +145,7 @@ class JSValueMarshaller {
             while (--degree > 1) {
                 insn = new InvokeInstruction();
                 insn.setMethod(JSMethods.ARRAY_MAPPER);
-                insn.getArguments().add(function);
+                insn.setArguments(function);
                 function = program.createVariable();
                 insn.setReceiver(function);
                 insn.setType(InvocationType.SPECIAL);
@@ -156,8 +156,7 @@ class JSValueMarshaller {
             insn = new InvokeInstruction();
             insn.setMethod(referenceCache.getCached(new MethodReference(JS.class.getName(), "map",
                     getWrappedType(type), ValueType.parse(Function.class), getWrapperType(type))));
-            insn.getArguments().add(var);
+            insn.setArguments(var, function);
-            insn.getArguments().add(function);
             insn.setReceiver(result);
             insn.setType(InvocationType.SPECIAL);
             insn.setLocation(location);
@@ -309,6 +308,7 @@ class JSValueMarshaller {
         InvokeInstruction insn = new InvokeInstruction();
         insn.setMethod(singleDimensionArrayUnwrapper(type));
         insn.setType(InvocationType.SPECIAL);
+        List<Variable> args = new ArrayList<>();
 
         if (insn.getMethod().parameterCount() == 2) {
             Variable cls = program.createVariable();
@@ -317,10 +317,11 @@ class JSValueMarshaller {
             clsInsn.setLocation(location.getSourceLocation());
             clsInsn.setReceiver(cls);
             replacement.add(clsInsn);
-            insn.getArguments().add(cls);
+            args.add(cls);
         }
 
-        insn.getArguments().add(var);
+        args.add(var);
+        insn.setArguments(args.toArray(new Variable[0]));
         insn.setReceiver(result);
         replacement.add(insn);
         return result;
@@ -340,7 +341,7 @@ class JSValueMarshaller {
             clsInsn.setLocation(location.getSourceLocation());
             clsInsn.setReceiver(cls);
             replacement.add(clsInsn);
-            insn.getArguments().add(cls);
+            insn.setArguments(cls);
         }
 
         insn.setReceiver(function);
@@ -359,8 +360,7 @@ class JSValueMarshaller {
             insn = new InvokeInstruction();
             insn.setMethod(JSMethods.ARRAY_UNMAPPER);
             insn.setType(InvocationType.SPECIAL);
-            insn.getArguments().add(cls);
+            insn.setArguments(cls, function);
-            insn.getArguments().add(function);
             function = program.createVariable();
             insn.setReceiver(function);
             replacement.add(insn);
@@ -375,9 +375,7 @@ class JSValueMarshaller {
 
         insn = new InvokeInstruction();
         insn.setMethod(JSMethods.UNMAP_ARRAY);
-        insn.getArguments().add(cls);
+        insn.setArguments(cls, var, function);
-        insn.getArguments().add(var);
-        insn.getArguments().add(function);
         insn.setReceiver(var);
         insn.setType(InvocationType.SPECIAL);
         insn.setLocation(location.getSourceLocation());
@@ -454,7 +452,7 @@ class JSValueMarshaller {
         InvokeInstruction insn = new InvokeInstruction();
         insn.setMethod(referenceCache.getCached(referenceCache.getCached(new MethodReference(
                 JS.class.getName(), methodName, argType, resultType))));
-        insn.getArguments().add(var);
+        insn.setArguments(var);
         insn.setReceiver(result);
         insn.setType(InvocationType.SPECIAL);
         insn.setLocation(location);
@@ -476,8 +474,7 @@ class JSValueMarshaller {
         insn.setType(InvocationType.SPECIAL);
         insn.setMethod(JSMethods.FUNCTION_AS_OBJECT);
         insn.setReceiver(functor);
-        insn.getArguments().add(var);
+        insn.setArguments(var, nameVar);
-        insn.getArguments().add(nameVar);
         insn.setLocation(location.getSourceLocation());
         replacement.add(insn);
         return functor;

metaprogramming/impl/src/main/java/org/teavm/metaprogramming/impl/CompositeMethodGenerator.java

@@ -406,7 +406,7 @@ public class CompositeMethodGenerator {
         InvokeInstruction insn = new InvokeInstruction();
         insn.setMethod(new MethodReference(wrapper, "valueOf", primitive, wrapper));
         insn.setType(InvocationType.SPECIAL);
-        insn.getArguments().add(var);
+        insn.setArguments(var);
         var = program.createVariable();
         insn.setReceiver(var);
         add(insn);
@@ -851,7 +851,7 @@ public class CompositeMethodGenerator {
             insn.setReceiver(var(receiver));
             insn.setMethod(method);
             insn.setType(type);
-            insn.getArguments().addAll(arguments.stream().map(this::var).collect(Collectors.toList()));
+            insn.setArguments(arguments.stream().map(this::var).toArray(Variable[]::new));
             add(insn);
         }
 
@@ -932,7 +932,7 @@ public class CompositeMethodGenerator {
                     insn.setType(Modifier.isStatic(reflectMethod.getModifiers()) ? InvocationType.SPECIAL
                             : InvocationType.VIRTUAL);
                     insn.setMethod(reflectMethod.method.getReference());
-                    emitArguments(var(arguments.get(1)), reflectMethod, insn.getArguments());
+                    insn.setArguments(emitArguments(var(arguments.get(1)), reflectMethod));
                     add(insn);
 
                     if (receiver != null) {
@@ -964,7 +964,7 @@ public class CompositeMethodGenerator {
                     insn.setInstance(constructInsn.getReceiver());
                     insn.setType(InvocationType.SPECIAL);
                     insn.setMethod(reflectMethod.method.getReference());
-                    emitArguments(var(arguments.get(0)), reflectMethod, insn.getArguments());
+                    insn.setArguments(emitArguments(var(arguments.get(0)), reflectMethod));
                     add(insn);
 
                     return true;
@@ -1054,14 +1054,14 @@ public class CompositeMethodGenerator {
             }
         }
 
-        private void emitArguments(Variable argumentsVar, ReflectMethodImpl reflectMethod,
+        private Variable[] emitArguments(Variable argumentsVar, ReflectMethodImpl reflectMethod) {
-                List<Variable> arguments) {
             UnwrapArrayInstruction unwrapInsn = new UnwrapArrayInstruction(ArrayElementType.OBJECT);
             unwrapInsn.setArray(argumentsVar);
             unwrapInsn.setReceiver(program.createVariable());
             add(unwrapInsn);
             argumentsVar = unwrapInsn.getReceiver();
 
+            Variable[] arguments = new Variable[reflectMethod.getParameterCount()];
             for (int i = 0; i < reflectMethod.getParameterCount(); ++i) {
                 IntegerConstantInstruction indexInsn = new IntegerConstantInstruction();
                 indexInsn.setConstant(i);
@@ -1074,9 +1074,10 @@ public class CompositeMethodGenerator {
                 extractArgInsn.setReceiver(program.createVariable());
                 add(extractArgInsn);
 
-                arguments.add(unbox(extractArgInsn.getReceiver(),
+                arguments[i] = unbox(extractArgInsn.getReceiver(), reflectMethod.method.parameterType(i));
-                        reflectMethod.method.parameterType(i)));
             }
+
+            return arguments;
         }
 
         private Variable unwrapArray(ValueType type, Variable array) {

metaprogramming/impl/src/main/java/org/teavm/metaprogramming/impl/ProxyVariableContext.java

@@ -130,9 +130,11 @@ public class ProxyVariableContext extends VariableContext {
         initInsn.setInstance(constructInsn.getReceiver());
         initInsn.setMethod(ctor.getReference());
         initInsn.setType(InvocationType.SPECIAL);
+        Variable[] initArgs = new Variable[capturedValues.size()];
         for (int i = 0; i < capturedValues.size(); ++i) {
-            initInsn.getArguments().add(capturedValues.get(i).value);
+            initArgs[i] =  capturedValues.get(i).value;
         }
+        initInsn.setArguments(initArgs);
         generator.add(initInsn);
 
         return constructInsn.getReceiver();

metaprogramming/impl/src/main/java/org/teavm/metaprogramming/impl/UsageGenerator.java

@@ -333,7 +333,7 @@ class UsageGenerator {
         InvokeInstruction insn = new InvokeInstruction();
         insn.setType(InvocationType.SPECIAL);
         insn.setMethod(new MethodReference(boxed, "valueOf", primitive, boxed));
-        insn.getArguments().add(var);
+        insn.setArguments(var);
         var = program.createVariable();
         insn.setReceiver(var);
 

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

@@ -80,8 +80,12 @@ class ResourceProgramTransformer {
             System.arraycopy(method.getDescriptor().getSignature(), 0, types, 1,
                     method.getDescriptor().parameterCount() + 1);
             accessInsn.setMethod(new MethodReference(ResourceAccessor.class.getName(), method.getName(), types));
-            accessInsn.getArguments().add(insn.getInstance());
+            Variable[] accessArgs = new Variable[insn.getArguments().size() + 1];
-            accessInsn.getArguments().addAll(insn.getArguments());
+            accessArgs[0] = insn.getInstance();
+            for (int i = 0; i < insn.getArguments().size(); ++i) {
+                accessArgs[i + 1] = insn.getArguments().get(i);
+            }
+            accessInsn.setArguments(accessArgs);
             accessInsn.setReceiver(insn.getReceiver());
             return Arrays.asList(accessInsn);
         }
@@ -111,13 +115,13 @@ class ResourceProgramTransformer {
         InvokeInstruction keysInsn = new InvokeInstruction();
         keysInsn.setType(InvocationType.SPECIAL);
         keysInsn.setMethod(KEYS);
-        keysInsn.getArguments().add(insn.getInstance());
+        keysInsn.setArguments(insn.getInstance());
         keysInsn.setReceiver(tmp);
 
         InvokeInstruction transformInsn = new InvokeInstruction();
         transformInsn.setType(InvocationType.SPECIAL);
         transformInsn.setMethod(KEYS_TO_STRINGS);
-        transformInsn.getArguments().add(tmp);
+        transformInsn.setArguments(tmp);
         transformInsn.setReceiver(insn.getReceiver());
 
         return Arrays.asList(keysInsn, transformInsn);
@@ -161,7 +165,7 @@ class ResourceProgramTransformer {
                     InvokeInstruction castInvoke = new InvokeInstruction();
                     castInvoke.setType(InvocationType.SPECIAL);
                     castInvoke.setMethod(CAST_TO_STRING);
-                    castInvoke.getArguments().add(resultVar);
+                    castInvoke.setArguments(resultVar);
                     castInvoke.setReceiver(insn.getReceiver());
                     instructions.add(castInvoke);
                     return instructions;
@@ -191,8 +195,7 @@ class ResourceProgramTransformer {
         InvokeInstruction accessorInvoke = new InvokeInstruction();
         accessorInvoke.setType(InvocationType.SPECIAL);
         accessorInvoke.setMethod(GET_PROPERTY);
-        accessorInvoke.getArguments().add(insn.getInstance());
+        accessorInvoke.setArguments(insn.getInstance(), nameVar);
-        accessorInvoke.getArguments().add(nameVar);
         accessorInvoke.setReceiver(resultVar);
         instructions.add(accessorInvoke);
     }
@@ -208,7 +211,7 @@ class ResourceProgramTransformer {
                 + primitiveCapitalized.substring(1);
         castInvoke.setMethod(new MethodReference(ResourceAccessor.class, "castTo" + primitiveCapitalized,
                 Object.class, primitive));
-        castInvoke.getArguments().add(resultVar);
+        castInvoke.setArguments(resultVar);
         castInvoke.setReceiver(insn.getReceiver());
         instructions.add(castInvoke);
     }
@@ -247,7 +250,7 @@ class ResourceProgramTransformer {
                     InvokeInstruction castInvoke = new InvokeInstruction();
                     castInvoke.setType(InvocationType.SPECIAL);
                     castInvoke.setMethod(CAST_FROM_STRING);
-                    castInvoke.getArguments().add(insn.getArguments().get(0));
+                    castInvoke.setArguments(insn.getArguments().get(0));
                     castInvoke.setReceiver(castVar);
                     instructions.add(castInvoke);
                     setProperty(insn, property, instructions, castVar);
@@ -272,9 +275,7 @@ class ResourceProgramTransformer {
         InvokeInstruction accessorInvoke = new InvokeInstruction();
         accessorInvoke.setType(InvocationType.SPECIAL);
         accessorInvoke.setMethod(PUT);
-        accessorInvoke.getArguments().add(insn.getInstance());
+        accessorInvoke.setArguments(insn.getInstance(), nameVar, valueVar);
-        accessorInvoke.getArguments().add(nameVar);
-        accessorInvoke.getArguments().add(valueVar);
         instructions.add(accessorInvoke);
     }
 
@@ -288,7 +289,7 @@ class ResourceProgramTransformer {
                 + primitiveCapitalized.substring(1);
         castInvoke.setMethod(new MethodReference(ResourceAccessor.class, "castFrom" + primitiveCapitalized,
                 primitive, Object.class));
-        castInvoke.getArguments().add(insn.getArguments().get(0));
+        castInvoke.setArguments(insn.getArguments().get(0));
         castInvoke.setReceiver(castVar);
         instructions.add(castInvoke);
         setProperty(insn, property, instructions, castVar);

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

@@ -60,7 +60,7 @@ public class StringAmplifierTransformer implements ClassHolderTransformer {
                         amplifyInstruction.setMethod(new MethodReference(StringAmplifier.class, "amplify",
                                 String.class, String.class));
                         amplifyInstruction.setType(InvocationType.SPECIAL);
-                        amplifyInstruction.getArguments().add(var);
+                        amplifyInstruction.setArguments(var);
                         amplifyInstruction.setReceiver(invoke.getReceiver());
                         amplifyInstruction.setLocation(invoke.getLocation());