This should allow to transpile Java to C code which can easily be transpiled to JS, WASM or native binaries. This will further utilize the LLVM toolchain.

IF expressions are often used with boolean conditions using a Compare expression. This is often very inefficient and should generally be avoided.

• we would like to translate our MontiCore Tool (19 MB JAR) from Java to JavaScript
• it is completely console based (no gui)
• but it uses at some point some reflection (groovy)

Does your tool supports it?
And how do I translate a complete JAR and launch it later in HTML, so that the console output will be visible?

Maybe it is not a good idea to let the memory manager run inside of WASM instance. The idea is now to let all memory management be done by the WASM host, and call memory manager and object access thru imported functions from within WASM. We have of course to test if this might be a performance bottleneck.

The generated JavaScript is far from being optimal and should be optimized.

Variables with only one initialization and this initialization is a constant (primitive, class reference or string constant pool) can be safely inlined as value and the variable can be removed.

Such as

• ceil
• floor
• round
• min
• max
• sin
• cos
• toRadians
• toDegrees
• tan

In some cases, we would like to also generate the "index.html" or some auxiliary javasript files that would be used with the compiler generated JavaScript file by processing some in-source annotations of our own. Bytecoder should be able to run the annotation processor if one detected in the jar file.

Hi, I found a bug (not that easy to reproduce) in the String concatenation:

public static String getOne() {
	return "1";
}

public static String getTwo() {
	return "2";
}

public static String getThree() {
	return "3";
}
	
public static void main(String[] args) {
	System.out.println(">"+getOne()+","+getTwo()+","+getThree()+"<");
}

Gives : ">3,2,1<" (wrong order)
I tracked the bug in webassembly to the moment the array contening the arguments of TStringConcatFactory.makeConcatWithConstants is constructed (Object[] args) :

(i32.store offset=44 (get_local $SP)
             (call $MemoryManager_AddressnewArrayINTINTINT (i32.const 0)                  (i32.const 3) (get_global $TArray__runtimeClass) (i32.const 85)) ;; new array of type de.mirkosertic.bytecoder.core.BytecodeObjectTypeRef@c2861ce2
         
         )
         ;; setting local variable with type INT with value of type INT
         (set_local $var7
             (i32.const 0)         
         )
         (i32.store offset=20 
             (i32.add (i32.load offset=44 (get_local $SP)) (i32.mul (get_local $var7) (i32.const 4)))
             (i32.load offset=32 (get_local $SP))
         )
         ;; setting local variable with type INT with value of type INT
         (set_local $var8
             (i32.const 1)         
         )
         (i32.store offset=20 
             (i32.add (i32.load offset=44 (get_local $SP)) (i32.mul (get_local $var8) (i32.const 4)))
             (i32.load offset=28 (get_local $SP))
         )
         ;; setting local variable with type INT with value of type INT
         (set_local $var9
             (i32.const 2)         
         )
         (i32.store offset=20 
             (i32.add (i32.load offset=44 (get_local $SP)) (i32.mul (get_local $var9) (i32.const 4)))
             (i32.load offset=4 (get_local $SP))
         )

Where $SP+4 contains the result from getOne(), $SP+20 the result from getTwo() and $SP+32 the result of getThree()

I would fix it myself but I did'nt found where in the compiler this code is generated (is it taken from the java bytecode as it ?)

Also, there is another bug related : if instead of String the results of getOne, getTwo or getThree are of type int, there is a out of bound error at runtime. Maybe the function treat the content of the array as objects adresses even if they are only simple int.

The current implementation fails to detect all redundant virtual method calls and thus cannot replace them with a direct call. This should be optimized.

Details:

https://github.com/mrdoob/stats.js

Results :

Tests in error:
testValueOfNegativeString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TByteTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testParseByte JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TByteTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testValueOfString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TByteTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testValueOfNegativeString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TDoubleTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TLong
testValueOfString2 JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TDoubleTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TLong
testValueOfString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TDoubleTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TLong
testParseDouble JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TDoubleTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TLong
testValueOfString1 JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TDoubleTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TLong
testValueOfNegativeString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TFloatTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TLong
testValueOfString2 JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TFloatTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TLong
testParseFloat JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TFloatTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TLong
testValueOfString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TFloatTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TLong
testValueOfString1 JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TFloatTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TLong
testValueOfNegativeString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TIntegerTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testValueOfString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TIntegerTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testParseInt JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TIntegerTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testValueOfNegativeString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TLongTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testValueOfString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TLongTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testParseLong JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TLongTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testValueOfNegativeString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TShortTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testValueOfString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TShortTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testParseShort JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TShortTest): Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
testSimpleExceptionFlow JS Backend jsssacompiler(de.mirkosertic.bytecoder.core.ExceptionHandlerTest): {stack=FLOATflowTest(..)
testRethrow JS Backend jsssacompiler(de.mirkosertic.bytecoder.core.ExceptionHandlerTest): {stack=VOIDthrowSomething(..)
testEquals JS Backend jsssacompiler(de.mirkosertic.bytecoder.core.StringTest): {stack=VOIDtestEquals(..)
testConcatenation JS Backend jsssacompiler(de.mirkosertic.bytecoder.core.StringTest): {stack=VOIDtestConcatenation(..)

Tests run: 434, Failures: 0, Errors: 26, Skipped: 0

[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO]
[INFO] Bytecoder Parent POM ............................... SUCCESS [ 0.733 s]
[INFO] Bytecoder Core ..................................... FAILURE [ 26.521 s]
[INFO] Bytecoder Maven Plugin ............................. SKIPPED
[INFO] Bytecoder Integrationtest .......................... SKIPPED
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE

Test set: de.mirkosertic.bytecoder.classlib.java.lang.TByteTest

Tests run: 26, Failures: 0, Errors: 3, Skipped: 0, Time elapsed: 0.535 sec <<< FAILURE!
testValueOfNegativeString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TByteTest) Time elapsed: 0.002 sec <<< ERROR!
java.lang.RuntimeException: Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
at de.mirkosertic.bytecoder.core.BytecodeLinkerContext.linkClass(BytecodeLinkerContext.java:114)
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKESTATIC.performLinking(BytecodeInstructionINVOKESTATIC.java:33)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkStaticMethod(BytecodeLinkedClass.java:326)
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKESTATIC.performLinking(BytecodeInstructionINVOKESTATIC.java:33)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkStaticMethod(BytecodeLinkedClass.java:326)
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKESTATIC.performLinking(BytecodeInstructionINVOKESTATIC.java:33)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkStaticMethod(BytecodeLinkedClass.java:326)
at de.mirkosertic.bytecoder.backend.CompileTarget.compileToJS(CompileTarget.java:82)
at de.mirkosertic.bytecoder.unittest.BytecoderUnitTestRunner.testJSBackendFrameworkMethod(BytecoderUnitTestRunner.java:127)
at de.mirkosertic.bytecoder.unittest.BytecoderUnitTestRunner.runChild(BytecoderUnitTestRunner.java:197)
at de.mirkosertic.bytecoder.unittest.BytecoderUnitTestRunner.runChild(BytecoderUnitTestRunner.java:1)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Caused by: java.lang.IllegalArgumentException: Error while linking virtual method name charValue for de.mirkosertic.bytecoder.classlib.java.lang.TFloat
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkVirtualMethod(BytecodeLinkedClass.java:285)
at de.mirkosertic.bytecoder.core.BytecodeLinkerContext.lambda$linkClass$1(BytecodeLinkerContext.java:106)
at java.base/java.util.HashMap$EntrySet.forEach(HashMap.java:1044)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.forEachVirtualMethod(BytecodeLinkedClass.java:380)
at de.mirkosertic.bytecoder.core.BytecodeLinkerContext.linkClass(BytecodeLinkerContext.java:103)
... 31 more
Caused by: java.lang.NullPointerException
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKEDYNAMIC.performLinking(BytecodeInstructionINVOKEDYNAMIC.java:59)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkVirtualMethod(BytecodeLinkedClass.java:252)
... 35 more

testParseByte JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TByteTest) Time elapsed: 0.007 sec <<< ERROR!
java.lang.RuntimeException: Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
at de.mirkosertic.bytecoder.core.BytecodeLinkerContext.linkClass(BytecodeLinkerContext.java:114)
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKESTATIC.performLinking(BytecodeInstructionINVOKESTATIC.java:33)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkStaticMethod(BytecodeLinkedClass.java:326)
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKESTATIC.performLinking(BytecodeInstructionINVOKESTATIC.java:33)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkStaticMethod(BytecodeLinkedClass.java:326)
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKESTATIC.performLinking(BytecodeInstructionINVOKESTATIC.java:33)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkStaticMethod(BytecodeLinkedClass.java:326)
at de.mirkosertic.bytecoder.backend.CompileTarget.compileToJS(CompileTarget.java:82)
at de.mirkosertic.bytecoder.unittest.BytecoderUnitTestRunner.testJSBackendFrameworkMethod(BytecoderUnitTestRunner.java:127)
at de.mirkosertic.bytecoder.unittest.BytecoderUnitTestRunner.runChild(BytecoderUnitTestRunner.java:197)
at de.mirkosertic.bytecoder.unittest.BytecoderUnitTestRunner.runChild(BytecoderUnitTestRunner.java:1)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Caused by: java.lang.IllegalArgumentException: Error while linking virtual method name charValue for de.mirkosertic.bytecoder.classlib.java.lang.TFloat
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkVirtualMethod(BytecodeLinkedClass.java:285)
at de.mirkosertic.bytecoder.core.BytecodeLinkerContext.lambda$linkClass$1(BytecodeLinkerContext.java:106)
at java.base/java.util.HashMap$EntrySet.forEach(HashMap.java:1044)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.forEachVirtualMethod(BytecodeLinkedClass.java:380)
at de.mirkosertic.bytecoder.core.BytecodeLinkerContext.linkClass(BytecodeLinkerContext.java:103)
... 31 more
Caused by: java.lang.NullPointerException
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKEDYNAMIC.performLinking(BytecodeInstructionINVOKEDYNAMIC.java:59)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkVirtualMethod(BytecodeLinkedClass.java:252)
... 35 more

testValueOfString JS Backend jsssacompiler(de.mirkosertic.bytecoder.classlib.java.lang.TByteTest) Time elapsed: 0.006 sec <<< ERROR!
java.lang.RuntimeException: Error linking class de.mirkosertic.bytecoder.classlib.java.lang.TFloat
at de.mirkosertic.bytecoder.core.BytecodeLinkerContext.linkClass(BytecodeLinkerContext.java:114)
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKESTATIC.performLinking(BytecodeInstructionINVOKESTATIC.java:33)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkStaticMethod(BytecodeLinkedClass.java:326)
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKESTATIC.performLinking(BytecodeInstructionINVOKESTATIC.java:33)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkStaticMethod(BytecodeLinkedClass.java:326)
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKESTATIC.performLinking(BytecodeInstructionINVOKESTATIC.java:33)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkStaticMethod(BytecodeLinkedClass.java:326)
at de.mirkosertic.bytecoder.backend.CompileTarget.compileToJS(CompileTarget.java:82)
at de.mirkosertic.bytecoder.unittest.BytecoderUnitTestRunner.testJSBackendFrameworkMethod(BytecoderUnitTestRunner.java:127)
at de.mirkosertic.bytecoder.unittest.BytecoderUnitTestRunner.runChild(BytecoderUnitTestRunner.java:197)
at de.mirkosertic.bytecoder.unittest.BytecoderUnitTestRunner.runChild(BytecoderUnitTestRunner.java:1)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
at org.apache.maven.surefire.junit4.JUnit4Provider.execute(JUnit4Provider.java:252)
at org.apache.maven.surefire.junit4.JUnit4Provider.executeTestSet(JUnit4Provider.java:141)
at org.apache.maven.surefire.junit4.JUnit4Provider.invoke(JUnit4Provider.java:112)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at org.apache.maven.surefire.util.ReflectionUtils.invokeMethodWithArray(ReflectionUtils.java:189)
at org.apache.maven.surefire.booter.ProviderFactory$ProviderProxy.invoke(ProviderFactory.java:165)
at org.apache.maven.surefire.booter.ProviderFactory.invokeProvider(ProviderFactory.java:85)
at org.apache.maven.surefire.booter.ForkedBooter.runSuitesInProcess(ForkedBooter.java:115)
at org.apache.maven.surefire.booter.ForkedBooter.main(ForkedBooter.java:75)
Caused by: java.lang.IllegalArgumentException: Error while linking virtual method name charValue for de.mirkosertic.bytecoder.classlib.java.lang.TFloat
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkVirtualMethod(BytecodeLinkedClass.java:285)
at de.mirkosertic.bytecoder.core.BytecodeLinkerContext.lambda$linkClass$1(BytecodeLinkerContext.java:106)
at java.base/java.util.HashMap$EntrySet.forEach(HashMap.java:1044)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.forEachVirtualMethod(BytecodeLinkedClass.java:380)
at de.mirkosertic.bytecoder.core.BytecodeLinkerContext.linkClass(BytecodeLinkerContext.java:103)
... 31 more
Caused by: java.lang.NullPointerException
at de.mirkosertic.bytecoder.core.BytecodeInstructionINVOKEDYNAMIC.performLinking(BytecodeInstructionINVOKEDYNAMIC.java:59)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkMethodInternal(BytecodeLinkedClass.java:364)
at de.mirkosertic.bytecoder.core.BytecodeLinkedClass.linkVirtualMethod(BytecodeLinkedClass.java:252)
... 35 more

Build a wasm reference compiler transfering the SSA Form into WebAssembly text syntax.

At the moment some optimizazion are hard to implement, as the Bytecoder IR is not fully graph based, which makes dependency analysis sometimes very tricky. This should be fixed by switching the IR to fully graph based.

GOTOs to dominated nodes can be replaced by inlining the dominated node. The current implementation can be greatly optimized.

Hi,
I just noticed that if you have a newline in a string, for instance : System.out.println("Hello\nWorld");, the generated .wat is ill-formed.
One simple fix is to change the line 729 of WASMSSACompilerBackend.java to : theWriter.println(theData.replaceAll("(?:\\n|\\r)", ""));
Best regards,
Karang

Chrome is launched in headless mode for every testcase. This dramatically increases system load and should be fixed by using a ChromeDriverService with a RemoteDriver

This will

• further reduce amount of variables
• allow better copy propagation
• allow faster generated code in consequence

The initialisation of 2D arrays generates an error when compiling.

        float[][] test1 = new float[][] {
            {1.0f, 0.0f, 0.0f, 1.0f}, 
            {1.0f, 1.0f, 0.0f, 1.0f},
            {0.0f, 1.0f, 0.0f, 1.0f}, 
            {1.0f, 0.5f, 0.5f, 1.0f}, 
            {1.0f, 0.0f, 1.0f, 1.0f},
            {0.0f, 0.0f, 1.0f, 1.0f} 
        };

The error :

Error running bytecoder: Error linking class [F: [F.class -> [Help 1]

Just instanciating the array without initialisation is working:

        float[][] test = new float[6][4];

If the project does not have too many dependencies, in the future, would it be possible to supply a simpler command line compilation as well so that we can use it with our own build tool?

It should be possible to add additional methods to the OpenCL kernel beside the processWorkItem Method. This would allow us to implement reusable common class libraries that could be used for machine learning for instance. Those methods include kernel methods and additional static depenciies that are not directly mapped to OpenCL built-in functions.

We could add a new Annotation to set a javascript implementation of a function when we declare it:

@Import(module = "webglcontext", name = "viewport")
@JSImpl("function(ref, x, y, width, height) {" + 
        "    webglCtx[ref].viewport(x, y, width, height);" + 
        "}")
public native void viewport(int x, int y, int width, int height);

This way the compiler could generate a lib_module.js for each module containing only the linked functions.
We could also place the anotation on the Class to provide a way to initialize a context (instances list) :

@JSImpl("var webglBuffer = [];" + 
        "var webglCtx = [];" + 
	"var webglFramebuffer = [];" + 
	"var webglProgram = [];" + 
	"var webglRenderbuffer = [];" + 
	"var webglRenderingContext = [];" + 
	"var webglShader = [];" + 
	"var webglShaderPrecisionFormat = [];" + 
	"var webglTexture = [];" + 
	"var webglUniformLoc = [];")
public class WebGLRenderingContext {

It would be easier for the library and api developpers to have all the code in one place.
The annotation could be optional, but then it is the responsability of the user to provide the implementations in the js wrapper.

Common case: inheritance hierarchies in non static classes and the this$ generated field.

There is the same runtime class code generated tor every used class. This can be further unified to save space and reduce compile and runtime overhead.

This would remove the WABT dependency from the project.

Bytecoder looks like a cool project. Have you considered using one of Soot's representations for the IR aspect?