More work on compiler

build.gradle

@@ -2,7 +2,8 @@ group 'asmble'
 version '1.0-SNAPSHOT'
 
 buildscript {
-    ext.kotlin_version = '1.1.0'
+    ext.kotlin_version = '1.1.1'
+    ext.asm_version = '5.2'
 
     repositories {
         mavenCentral()
@@ -21,6 +22,9 @@ repositories {
 
 dependencies {
     compile "org.jetbrains.kotlin:kotlin-stdlib:$kotlin_version"
-    testCompile "junit:junit:4.12"
+    compile "org.jetbrains.kotlin:kotlin-reflect:$kotlin_version"
+    compile "org.ow2.asm:asm-tree:$asm_version"
+    compile "org.ow2.asm:asm-util:$asm_version"
+    testCompile 'junit:junit:4.12'
     testCompile "org.jetbrains.kotlin:kotlin-test-junit:$kotlin_version"
 }

src/main/kotlin/asmble/ast/Node.kt

@@ -120,7 +120,7 @@ sealed class Node {
             interface Index : Args { val index: Int }
             interface Reserved : Args { val reserved: Boolean }
             interface ReservedIndex : Index, Reserved
-            interface AlignOffset : Args { val align: Int; val offset: Int }
+            interface AlignOffset : Args { val align: Int; val offset: Long }
             interface Const<out T : Number> : Args { val value: T }
         }
 
@@ -159,29 +159,29 @@ sealed class Node {
         data class SetGlobal(override val index: Int) : Instr(), Args.Index
 
         // Memory operators
-        data class I32Load(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I64Load(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class F32Load(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class F64Load(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I32Load8S(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I32Load8U(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I32Load16S(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I32Load16U(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I64Load8S(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I64Load8U(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I64Load16S(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I64Load16U(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I64Load32S(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I64Load32U(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I32Store(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I64Store(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class F32Store(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class F64Store(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I32Store8(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I32Store16(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I64Store8(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I64Store16(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
-        data class I64Store32(override val align: Int, override val offset: Int) : Instr(), Args.AlignOffset
+        data class I32Load(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I64Load(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class F32Load(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class F64Load(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I32Load8S(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I32Load8U(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I32Load16S(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I32Load16U(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I64Load8S(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I64Load8U(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I64Load16S(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I64Load16U(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I64Load32S(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I64Load32U(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I32Store(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I64Store(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class F32Store(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class F64Store(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I32Store8(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I32Store16(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I64Store8(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I64Store16(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
+        data class I64Store32(override val align: Int, override val offset: Long) : Instr(), Args.AlignOffset
         data class CurrentMemory(override val reserved: Boolean) : Instr(), Args.Reserved
         data class GrowMemory(override val reserved: Boolean) : Instr(), Args.Reserved
 
@@ -351,7 +351,7 @@ sealed class Node {
         }
 
         sealed class MemOp<out A : Instr.Args> : InstrOp<A>() {
-            data class AlignOffsetArg(override val name: String, val create: (Int, Int) -> Instr) : MemOp<Instr.Args.AlignOffset>()
+            data class AlignOffsetArg(override val name: String, val create: (Int, Long) -> Instr) : MemOp<Instr.Args.AlignOffset>()
             data class ReservedArg(override val name: String, val create: (Boolean) -> Instr) : MemOp<Instr.Args.Reserved>()
         }
 

src/main/kotlin/asmble/ast/SExpr.kt

@@ -1,6 +1,12 @@
 package asmble.ast
 
+import asmble.io.SExprToStr
+
 sealed class SExpr {
-    data class Multi(val vals: List<SExpr> = emptyList()) : SExpr()
-    data class Symbol(val contents: String = "", val quoted: Boolean = false) : SExpr()
+    data class Multi(val vals: List<SExpr> = emptyList()) : SExpr() {
+        override fun toString() = SExprToStr.Compact.fromSExpr(this)
+    }
+    data class Symbol(val contents: String = "", val quoted: Boolean = false) : SExpr() {
+        override fun toString() = SExprToStr.Compact.fromSExpr(this)
+    }
 }

src/main/kotlin/asmble/compile/jvm/AsmExt.kt

@@ -0,0 +1,47 @@
+package asmble.compile.jvm
+
+import org.objectweb.asm.Opcodes
+import org.objectweb.asm.Type
+import org.objectweb.asm.tree.*
+import kotlin.reflect.KClass
+import kotlin.reflect.KFunction
+import kotlin.reflect.KProperty
+import kotlin.reflect.jvm.javaField
+import kotlin.reflect.jvm.javaMethod
+import kotlin.reflect.jvm.reflect
+
+val <R> KFunction<R>.asmDesc: String get() = Type.getMethodDescriptor(this.javaMethod)
+
+val <R> KFunction<R>.declarer: Class<*> get() = this.javaMethod!!.declaringClass
+
+fun KFunction<*>.invokeStatic() =
+    MethodInsnNode(Opcodes.INVOKESTATIC, this.declarer.asmName, this.name, this.asmDesc, false)
+
+fun KFunction<*>.invokeVirtual() =
+    MethodInsnNode(Opcodes.INVOKEVIRTUAL, this.declarer.asmName, this.name, this.asmDesc, false)
+
+inline fun <T> forceType(fn: T) = fn
+inline fun <T : Function<*>> forceFnType(fn: T) = fn.reflect()!!
+
+val <T : Any> KClass<T>.asmName: String get() = this.java.asmName
+
+val <T : Any> Class<T>.asmName: String get() = Type.getInternalName(this)
+
+val KProperty<*>.declarer: Class<*> get() = this.javaField!!.declaringClass
+val KProperty<*>.asmDesc: String get() = Type.getDescriptor(this.javaField!!.type)
+
+fun KProperty<*>.getStatic() =
+    FieldInsnNode(Opcodes.GETSTATIC, this.declarer.asmName, this.name, this.asmDesc)
+
+val Int.const: AbstractInsnNode get() = when (this) {
+    -1 -> InsnNode(Opcodes.ICONST_M1)
+    0 -> InsnNode(Opcodes.ICONST_0)
+    1 -> InsnNode(Opcodes.ICONST_1)
+    2 -> InsnNode(Opcodes.ICONST_2)
+    3 -> InsnNode(Opcodes.ICONST_3)
+    4 -> InsnNode(Opcodes.ICONST_4)
+    5 -> InsnNode(Opcodes.ICONST_5)
+    in 6..Byte.MAX_VALUE -> IntInsnNode(Opcodes.BIPUSH, this)
+    in (Byte.MAX_VALUE + 1)..Short.MAX_VALUE -> IntInsnNode(Opcodes.SIPUSH, this)
+    else -> LdcInsnNode(this)
+}

src/main/kotlin/asmble/compile/jvm/AstToAsm.kt

@@ -0,0 +1,10 @@
+package asmble.compile.jvm
+
+import asmble.ast.Node
+import org.objectweb.asm.tree.ClassNode
+
+open class AstToAsm {
+    fun fromModule(n: Node.Module): ClassNode {
+        TODO()
+    }
+}

src/main/kotlin/asmble/compile/jvm/ByteBufferMem.kt

@@ -0,0 +1,153 @@
+package asmble.compile.jvm
+
+import asmble.ast.Node
+import org.objectweb.asm.Opcodes
+import org.objectweb.asm.tree.InsnNode
+import org.objectweb.asm.tree.IntInsnNode
+import org.objectweb.asm.tree.TypeInsnNode
+import java.nio.Buffer
+import java.nio.ByteBuffer
+import java.nio.ByteOrder
+import kotlin.reflect.KClass
+import kotlin.reflect.KFunction
+import kotlin.reflect.jvm.reflect
+
+open class ByteBufferMem(val direct: Boolean = true, val defaultMax: Int = 5 * Mem.PAGE_SIZE) : Mem<ByteBuffer> {
+    override val memClass = ByteBuffer::class.java
+
+    override fun create(func: Func, maximum: Int?) = func.addInsns(
+        (maximum ?: defaultMax).const,
+        (if (direct) ByteBuffer::allocateDirect else ByteBuffer::allocate).invokeStatic()
+    ).push(memClass)
+
+    override fun init(func: Func, initial: Int) = func.popExpecting(memClass).addInsns(
+        // Set the limit to initial
+        initial.const,
+        forceFnType<ByteBuffer.(Int) -> Buffer>(ByteBuffer::limit).invokeVirtual(),
+        TypeInsnNode(Opcodes.CHECKCAST, ByteBuffer::class.asmName),
+        // Set it to use little endian
+        ByteOrder::LITTLE_ENDIAN.getStatic(),
+        forceFnType<ByteBuffer.(ByteOrder) -> ByteBuffer>(ByteBuffer::order).invokeVirtual()
+    ).push(ByteBuffer::class.java)
+
+    override fun data(func: Func, bytes: ByteArray, buildOffset: (Func) -> Func) = func.
+        popExpecting(memClass).
+        addInsns(
+                bytes.size.const,
+                IntInsnNode(Opcodes.NEWARRAY, Opcodes.T_BYTE),
+                *bytes.withIndex().flatMap { (index, byte) ->
+                    listOf(InsnNode(Opcodes.DUP), index.const, byte.toInt().const)
+                }.toTypedArray()
+        ).
+        apply(buildOffset).popExpecting(Int::class.java).
+        // BOO! https://discuss.kotlinlang.org/t/overload-resolution-ambiguity-function-reference-requiring-local-var/2425
+        addInsns(forceFnType<ByteBuffer.(ByteArray, Int, Int) -> ByteBuffer>(ByteBuffer::put).invokeVirtual()).
+        push(memClass)
+
+    override fun currentMemory(func: Func) = func.popExpecting(memClass).addInsns(
+        forceFnType<ByteBuffer.() -> Int>(ByteBuffer::limit).invokeVirtual(),
+        Mem.PAGE_SIZE.const,
+        InsnNode(Opcodes.IDIV)
+    ).push(Int::class.java)
+
+    override fun growMemory(func: Func) = func.popExpecting(memClass).popExpecting(Int::class.java).addInsns(
+        Mem.PAGE_SIZE.const,
+        // TODO: overflow check, e.g. Math.multiplyExact
+        InsnNode(Opcodes.IMUL),
+        forceFnType<ByteBuffer.(Int) -> Buffer>(ByteBuffer::limit).invokeVirtual()
+    ).push(ByteBuffer::class.java)
+
+    override fun loadOp(func: Func, insn: Node.Instr.Args.AlignOffset) = func.popExpecting(memClass).let { func ->
+        require(insn.offset <= Int.MAX_VALUE, { "Offsets > ${Int.MAX_VALUE} unsupported" }).let { this }
+        fun Func.load(fn: ByteBuffer.(Int) -> Any, retClass: KClass<*>) =
+            this.addInsns(insn.offset.toInt().const, fn.reflect()!!.invokeVirtual()).push(retClass.java)
+        fun Func.loadI32(fn: ByteBuffer.(Int) -> Any) =
+            this.load(fn, Int::class)
+        fun Func.loadI64(fn: ByteBuffer.(Int) -> Any) =
+            this.load(fn, Long::class)
+        fun Func.toUnsigned(fn: KFunction<*>) =
+            this.addInsns(fn.invokeVirtual())
+        fun Func.toUnsigned64(fn: KFunction<*>) =
+            this.popExpecting(Int::class.java).toUnsigned(fn).push(Long::class.java)
+        fun Func.i32ToI64() =
+            this.popExpecting(Int::class.java).addInsns(InsnNode(Opcodes.I2L)).push(Long::class.java)
+        when (insn) {
+            is Node.Instr.I32Load ->
+                func.loadI32(ByteBuffer::getInt)
+            is Node.Instr.I64Load ->
+                func.loadI64(ByteBuffer::getLong)
+            is Node.Instr.F32Load ->
+                func.load(ByteBuffer::getFloat, Float::class)
+            is Node.Instr.F64Load ->
+                func.load(ByteBuffer::getDouble, Double::class)
+            is Node.Instr.I32Load8S ->
+                func.loadI32(ByteBuffer::get)
+            is Node.Instr.I32Load8U ->
+                func.loadI32(ByteBuffer::get).toUnsigned(java.lang.Byte::toUnsignedInt)
+            is Node.Instr.I32Load16S ->
+                func.loadI32(ByteBuffer::getShort)
+            is Node.Instr.I32Load16U ->
+                func.loadI32(ByteBuffer::getShort).toUnsigned(java.lang.Short::toUnsignedInt)
+            is Node.Instr.I64Load8S ->
+                func.loadI32(ByteBuffer::get).i32ToI64()
+            is Node.Instr.I64Load8U ->
+                func.loadI32(ByteBuffer::get).toUnsigned64(java.lang.Byte::toUnsignedLong)
+            is Node.Instr.I64Load16S ->
+                func.loadI32(ByteBuffer::getShort).i32ToI64()
+            is Node.Instr.I64Load16U ->
+                func.loadI32(ByteBuffer::getShort).toUnsigned64(java.lang.Short::toUnsignedLong)
+            is Node.Instr.I64Load32S ->
+                func.loadI32(ByteBuffer::getInt).i32ToI64()
+            is Node.Instr.I64Load32U ->
+                func.loadI32(ByteBuffer::getInt).toUnsigned64(java.lang.Integer::toUnsignedLong)
+            else -> throw IllegalArgumentException("Unknown load op $insn")
+        }
+    }
+
+    override fun storeOp(func: Func, insn: Node.Instr.Args.AlignOffset) = func.popExpecting(memClass).let { func ->
+        require(insn.offset <= Int.MAX_VALUE, { "Offsets > ${Int.MAX_VALUE} unsupported" }).let { this }
+        fun <T> Func.store32(fn: ByteBuffer.(Int, T) -> ByteBuffer, inClass: KClass<*>) =
+            // We add the index and then swap with the value already on the stack
+            this.popExpecting(inClass.java).addInsns(
+                insn.offset.toInt().const,
+                InsnNode(Opcodes.SWAP),
+                fn.reflect()!!.invokeVirtual()
+            ).push(ByteBuffer::class.java)
+        fun <T> Func.store64(fn: ByteBuffer.(Int, T) -> ByteBuffer, inClass: KClass<*>) =
+            // We add the offset, dup_x2 to swap, and pop to get rid of the dup offset
+            this.popExpecting(inClass.java).addInsns(
+                insn.offset.toInt().const,
+                InsnNode(Opcodes.DUP_X2),
+                InsnNode(Opcodes.POP),
+                fn.reflect()!!.invokeVirtual()
+            ).push(ByteBuffer::class.java)
+        fun Func.changeI64ToI32() =
+            this.popExpecting(Long::class.java).push(Int::class.java)
+        when (insn) {
+            is Node.Instr.I32Store ->
+                func.store32(ByteBuffer::putInt, Int::class)
+            is Node.Instr.I64Store ->
+                func.store64(ByteBuffer::putLong, Long::class)
+            is Node.Instr.F32Store ->
+                func.store32(ByteBuffer::putFloat, Float::class)
+            is Node.Instr.F64Store ->
+                func.store64(ByteBuffer::putDouble, Double::class)
+            is Node.Instr.I32Store8 ->
+                func.addInsns(InsnNode(Opcodes.I2B)).store32(ByteBuffer::put, Int::class)
+            is Node.Instr.I32Store16 ->
+                func.addInsns(InsnNode(Opcodes.I2S)).store32(ByteBuffer::putShort, Int::class)
+            is Node.Instr.I64Store8 ->
+                func.addInsns(InsnNode(Opcodes.L2I), InsnNode(Opcodes.I2B)).
+                    changeI64ToI32().store32(ByteBuffer::put, Int::class)
+            is Node.Instr.I64Store16 ->
+                func.addInsns(InsnNode(Opcodes.L2I), InsnNode(Opcodes.I2S)).
+                    changeI64ToI32().store32(ByteBuffer::putShort, Int::class)
+            is Node.Instr.I64Store32 ->
+                func.addInsns(InsnNode(Opcodes.L2I)).
+                    changeI64ToI32().store32(ByteBuffer::putInt, Int::class)
+            else -> throw IllegalArgumentException("Unknown store op $insn")
+        }
+    }
+
+    companion object : ByteBufferMem()
+}

src/main/kotlin/asmble/compile/jvm/Func.kt

@@ -0,0 +1,23 @@
+package asmble.compile.jvm
+
+import asmble.ast.Node
+import org.objectweb.asm.tree.AbstractInsnNode
+
+data class Func(val insns: List<AbstractInsnNode>, val stack: List<Class<*>>) {
+
+    fun addInsns(vararg insns: AbstractInsnNode) = copy(insns = this.insns + insns)
+
+    fun apply(fn: (Func) -> Func) = fn(this)
+
+    fun push(vararg types: Class<*>) = copy(stack = stack + types)
+
+    fun popExpectingNum() = popExpecting(Int::class.java, Long::class.java, Float::class.java, Double::class.java)
+
+    fun popExpecting(vararg types: Class<*>) = popExpectingAny(types::contains)
+
+    fun popExpectingAny(pred: (Class<*>) -> Boolean): Func {
+        require(stack.isNotEmpty(), { "Stack is empty" })
+        require(pred(stack.last()), { "Stack var type ${stack.last()} unexpected" })
+        return copy(stack = stack.dropLast(1))
+    }
+}

src/main/kotlin/asmble/compile/jvm/Mem.kt

@@ -0,0 +1,40 @@
+package asmble.compile.jvm
+
+import asmble.ast.Node
+
+interface Mem<T : Any> {
+    // The class to accept as "memory"
+    val memClass: Class<T>
+
+    fun create(func: Func, maximum: Int?): Func
+
+    // Caller can trust the mem instance is on the stack and must handle it. If
+    // it's already there after call anyways, this can leave the mem inst on the
+    // stack and it will be reused or popped.
+    fun init(func: Func, initial: Int): Func
+
+    // Caller can trust the mem instance is on the stack, buildOffset puts
+    // offset on the stack. If it's already there after call anyways, this can
+    // leave the mem inst on the stack and it will be reused or popped.
+    fun data(func: Func, bytes: ByteArray, buildOffset: (Func) -> Func): Func
+
+    // Caller can trust the mem instance is on the stack.
+    fun currentMemory(func: Func): Func
+
+    // Caller can trust the mem instance and then i32 page count is on the stack.
+    // If it's already there after call anyways, this can leave the mem inst on
+    // the stack and it will be reused or popped.
+    fun growMemory(func: Func): Func
+
+    // Caller can trust the mem instance is on the stack
+    fun loadOp(func: Func, insn: Node.Instr.Args.AlignOffset): Func
+
+    // Caller can trust the mem instance is on the stack followed
+    // by the value. If it's already there after call anyways, this can
+    // leave the mem inst on the stack and it will be reused or popped.
+    fun storeOp(func: Func, insn: Node.Instr.Args.AlignOffset): Func
+
+    companion object {
+        const val PAGE_SIZE = 65536
+    }
+}

src/main/kotlin/asmble/io/AstToSExpr.kt

@@ -2,9 +2,34 @@ package asmble.io
 
 import asmble.ast.Node
 import asmble.ast.SExpr
+import asmble.ast.Script
 
 open class AstToSExpr {
 
+    fun fromAction(v: Script.Cmd.Action) = when(v) {
+        is Script.Cmd.Action.Invoke -> newMulti("invoke", v.name) + v.string + fromInstrs(v.exprs)
+        is Script.Cmd.Action.Get -> newMulti("get", v.name) + v.string
+    }
+
+    fun fromAssertion(v: Script.Cmd.Assertion) = when(v) {
+        is Script.Cmd.Assertion.Return -> newMulti("assert_return") + fromAction(v.action) + fromInstrs(v.exprs)
+        is Script.Cmd.Assertion.ReturnNan -> newMulti("assert_return_nan") + fromAction(v.action)
+        is Script.Cmd.Assertion.Trap -> newMulti("assert_trap") + fromAction(v.action) + v.failure
+        is Script.Cmd.Assertion.Malformed -> newMulti("assert_malformed") + fromModule(v.module) + v.failure
+        is Script.Cmd.Assertion.Invalid -> newMulti("assert_invalid") + fromModule(v.module) + v.failure
+        is Script.Cmd.Assertion.SoftInvalid -> newMulti("assert_soft_invalid") + fromModule(v.module) + v.failure
+        is Script.Cmd.Assertion.Unlinkable -> newMulti("assert_unlinkable") + fromModule(v.module) + v.failure
+        is Script.Cmd.Assertion.TrapModule -> newMulti("assert_trap") + fromModule(v.module) + v.failure
+    }
+
+    fun fromCmd(v: Script.Cmd): SExpr.Multi = when(v) {
+        is Script.Cmd.Module -> fromModule(v.module)
+        is Script.Cmd.Register -> fromRegister(v)
+        is Script.Cmd.Action -> fromAction(v)
+        is Script.Cmd.Assertion -> fromAssertion(v)
+        is Script.Cmd.Meta -> fromMeta(v)
+    }
+
     fun fromData(v: Node.Data) =
         (newMulti("data") + v.index) + (newMulti("offset") + fromInstrs(v.offset)) + v.data.toString(Charsets.UTF_8)
 
@@ -100,16 +125,19 @@ open class AstToSExpr {
 
     fun fromMemorySig(v: Node.Type.Memory) = fromResizableLimits(v.limits)
 
+    fun fromMeta(v: Script.Cmd.Meta) = when(v) {
+        is Script.Cmd.Meta.Script -> newMulti("script", v.name) + fromScript(v.script)
+        is Script.Cmd.Meta.Input -> newMulti("input", v.name) + v.str
+        is Script.Cmd.Meta.Output -> newMulti("output", v.name) + v.str
+    }
+
     fun fromModule(v: Node.Module, name: String? = null): SExpr.Multi {
         var ret = newMulti("module", name)
 
         // We only want types that are not referenced in import
-        val ignoreTypeIndices = v.imports.mapNotNull {
-            (it.kind as? Node.Import.Kind.Func)?.let { it.typeIndex }
-        }.toSet()
+        val ignoreTypeIndices = v.imports.mapNotNull { (it.kind as? Node.Import.Kind.Func)?.typeIndex }.toSet()
 
         ret += v.types.filterIndexed { i, _ -> ignoreTypeIndices.contains(i) }.map { fromTypeDef(it) }
-        ret += v.funcs.map { fromFunc(it) }
         ret += v.imports.map { fromImport(it, v.types) }
         ret += v.exports.map(this::fromExport)
         ret += v.tables.map { fromTable(it) }
@@ -118,13 +146,18 @@ open class AstToSExpr {
         ret += v.elems.map(this::fromElem)
         ret += v.data.map(this::fromData)
         ret += v.startFuncIndex?.let(this::fromStart)
+        ret += v.funcs.map { fromFunc(it) }
         return ret
     }
 
     fun fromNum(v: Number) = fromString(v.toString())
 
+    fun fromRegister(v: Script.Cmd.Register) = (newMulti("register") + v.string) + v.name
+
     fun fromResizableLimits(v: Node.ResizableLimits) = listOfNotNull(fromNum(v.initial), v.maximum?.let(this::fromNum))
 
+    fun fromScript(v: Script) = v.commands.map(this::fromCmd)
+
     fun fromStart(v: Int) = newMulti("start") + v
 
     fun fromString(v: String, quoted: Boolean = false) = SExpr.Symbol(v, quoted)

src/main/kotlin/asmble/io/SExprToAst.kt

@@ -224,7 +224,7 @@ open class SExprToAst {
         val name = exp.maybeName(currIndex)
         if (name != null) currIndex++
         val maybeImpExp = toImportOrExportMaybe(exp, currIndex)
-        if (maybeImpExp == null) currIndex++
+        if (maybeImpExp != null) currIndex++
         val sig = toGlobalSig(exp.vals[currIndex])
         currIndex++
         val (instrs, _) = toInstrs(exp, currIndex, ExprContext(nameMap))
@@ -268,7 +268,12 @@ open class SExprToAst {
         }
     }
 
-    fun toInstrs(exp: SExpr.Multi, offset: Int, ctx: ExprContext): Pair<List<Node.Instr>, Int> {
+    fun toInstrs(
+        exp: SExpr.Multi,
+        offset: Int,
+        ctx: ExprContext,
+        mustCompleteExp: Boolean = true
+    ): Pair<List<Node.Instr>, Int> {
         var runningOffset = 0
         var ret = emptyList<Node.Instr>()
         while (offset + runningOffset < exp.vals.size) {
@@ -277,13 +282,16 @@ open class SExprToAst {
             ret += maybeInstrAndOffset.first
             runningOffset += maybeInstrAndOffset.second
         }
+        if (mustCompleteExp) require(offset + runningOffset == exp.vals.size) {
+            "Unrecognized instruction: ${exp.vals[offset + runningOffset]}"
+        }
         return Pair(ret, runningOffset)
     }
 
     fun toInstrMaybe(exp: SExpr.Multi, offset: Int, ctx: ExprContext): Pair<List<Node.Instr>, Int> {
         // <expr>
         if (exp.vals[offset] is SExpr.Multi) {
-            val exprs = toExprMaybe(exp, ctx)
+            val exprs = toExprMaybe(exp.vals[offset] as SExpr.Multi, ctx)
             return Pair(exprs, if (exprs.isEmpty()) 0 else 1)
         }
         // <op>
@@ -364,7 +372,7 @@ open class SExprToAst {
         val name = exp.maybeName(currIndex)
         if (name != null) currIndex++
         val maybeImpExp = toImportOrExportMaybe(exp, currIndex)
-        if (maybeImpExp == null) currIndex++
+        if (maybeImpExp != null) currIndex++
         // Try data approach
         if (exp.vals[currIndex] is SExpr.Multi) throw Exception("Data string not yet supported for memory")
         return Triple(name, toMemorySig(exp, currIndex), maybeImpExp)
@@ -537,11 +545,11 @@ open class SExprToAst {
             is InstrOp.VarOp.IndexArg -> Pair(op.create(oneVar()), 2)
             is InstrOp.MemOp.AlignOffsetArg -> {
                 var count = 1
-                var instrOffset = 0
+                var instrOffset = 0L
                 var instrAlign = 0
                 if (exp.vals.size > offset + count) exp.vals[offset + count].symbolStr().also {
                     if (it != null && it.startsWith("offset=")) {
-                        instrOffset = it.substring(7).toInt()
+                        instrOffset = it.substring(7).toLong()
                         count++
                     }
                 }
@@ -605,7 +613,7 @@ open class SExprToAst {
         val name = exp.maybeName(currIndex)
         if (name != null) currIndex++
         val maybeImpExp = toImportOrExportMaybe(exp, currIndex)
-        if (maybeImpExp == null) currIndex++
+        if (maybeImpExp != null) currIndex++
         // Try elem type approach
         val elemType = toElemTypeMaybe(exp, currIndex)
         if (elemType != null) {

src/main/kotlin/asmble/io/SExprToStr.kt

@@ -2,7 +2,11 @@ package asmble.io
 
 import asmble.ast.SExpr
 
-open class SExprToStr(val depthBeforeNewline: Int, val indent: String) {
+open class SExprToStr(val depthBeforeNewline: Int, val countBeforeNewlineAll: Int, val indent: String) {
+
+    @Suppress("UNCHECKED_CAST") // TODO: why?
+    fun fromSExpr(vararg exp: SExpr): String = appendAll(exp.asList(), StringBuilder()).trim().toString()
+
     @Suppress("UNCHECKED_CAST") // TODO: why?
     fun <T : Appendable> append(exp: SExpr, sb: T = StringBuilder() as T, indentLevel: Int = 0) = when(exp) {
         is SExpr.Symbol -> appendSymbol(exp, sb)
@@ -16,11 +20,12 @@ open class SExprToStr(val depthBeforeNewline: Int, val indent: String) {
             sb.append('"')
             exp.contents.forEach {
                 sb.append(
-                        if (it in "'\"\\") "\\$it"
-                        else if (it == '\n') "\\n"
-                        else if (it == '\t') "\\t"
-                        else if (!it.requiresQuote) it.toString()
-                        else "\\" + (it.toInt() and 0xFF).toString(16)
+                    if (it in "'\"\\") "\\$it"
+                    else if (it == '\n') "\\n"
+                    else if (it == '\t') "\\t"
+                    else if (it == ' ') " "
+                    else if (!it.requiresQuote) it.toString()
+                    else "\\" + (it.toInt() and 0xFF).toString(16)
                 )
             }
             sb.append('"')
@@ -31,17 +36,32 @@ open class SExprToStr(val depthBeforeNewline: Int, val indent: String) {
     @Suppress("UNCHECKED_CAST") // TODO: why?
     fun <T : Appendable> appendMulti(exp: SExpr.Multi, sb: T = StringBuilder() as T, indentLevel: Int = 0): T {
         sb.append('(')
-        exp.vals.forEachIndexed { index, sub ->
-            if (sub.maxDepth() <= depthBeforeNewline) {
-                if (index > 0) sb.append(' ')
+        appendAll(exp.vals, sb, indentLevel)
+        sb.append(')')
+        return sb
+    }
+
+    @Suppress("UNCHECKED_CAST") // TODO: why?
+    fun <T : Appendable> appendAll(exps: List<SExpr>, sb: T = StringBuilder() as T, indentLevel: Int = 0): T {
+        val newlineAll = exps.sumBy { it.count() } >= countBeforeNewlineAll
+        var wasLastNewline = false
+        exps.forEachIndexed { index, sub ->
+            // No matter what, if the first is a symbol
+            val isFirstAsSymbol = index == 0 && sub is SExpr.Symbol
+            val shouldNewline = !isFirstAsSymbol && (newlineAll || sub.maxDepth() > depthBeforeNewline)
+            if (!shouldNewline) {
+                if (index > 0 && !wasLastNewline) sb.append(' ')
                 append(sub, sb, indentLevel)
+                wasLastNewline = false
             } else {
-                sb.append("\n").append(indent.repeat(indentLevel + 1))
+                if (!wasLastNewline) sb.append("\n").append(indent.repeat(indentLevel))
                 append(sub, sb, indentLevel + 1)
-                sb.append("\n").append(indent.repeat(indentLevel))
+                sb.append("\n")
+                if (index < exps.size - 1) sb.append(indent.repeat(indentLevel))
+                else if (indentLevel > 0) sb.append(indent.repeat(indentLevel - 1))
+                wasLastNewline = true
             }
         }
-        sb.append(')')
         return sb
     }
 
@@ -50,10 +70,17 @@ open class SExprToStr(val depthBeforeNewline: Int, val indent: String) {
     val Char.requiresQuote: Boolean get() =
         this > '~' || (!this.isLetterOrDigit() && this !in "_.+-*/^~=<>!?@#$%&|:'`")
 
+    fun SExpr.count(): Int = when(this) {
+        is SExpr.Symbol -> 1
+        is SExpr.Multi -> this.vals.sumBy { it.count() }
+    }
+
     fun SExpr.maxDepth(): Int = when(this) {
         is SExpr.Symbol -> 0
         is SExpr.Multi -> 1 + (this.vals.map { it.maxDepth() }.max() ?: 0)
     }
 
-    companion object : SExprToStr(depthBeforeNewline = 3, indent = "  ")
+    companion object : SExprToStr(depthBeforeNewline = 3, countBeforeNewlineAll = 10, indent = "  ") {
+        val Compact = SExprToStr(depthBeforeNewline = Int.MAX_VALUE, countBeforeNewlineAll = Int.MAX_VALUE, indent = "")
+    }
 }

src/main/kotlin/asmble/io/StrToSExpr.kt

@@ -1,31 +1,38 @@
 package asmble.io
 
 import asmble.ast.SExpr
-import asmble.util.Either
+import asmble.util.IdentityMap
+import asmble.util.plus
 
 open class StrToSExpr {
-    data class ParseError(val line: Int, val char: Int, val msg: String)
+    sealed class ParseResult {
+        data class Pos(val line: Int, val char: Int)
+        data class Success(val vals: List<SExpr>, val exprOffsetMap: IdentityMap<SExpr, Pos>) : ParseResult()
+        data class Error(val pos: Pos, val msg: String) : ParseResult()
+    }
 
-    fun parse(str: CharSequence): Either<SExpr.Multi, ParseError> {
+    fun parse(str: CharSequence): ParseResult {
         val state = ParseState(str)
         var ret = emptyList<SExpr>()
         while (!state.isEof) {
             ret += state.nextSExpr() ?: break
-            if (state.err != null) {
-                val line = str.substring(0, state.offset).substringCount("\n") + 1
-                val char = state.offset - str.lastIndexOf('\n', state.offset)
-                return Either.Right(ParseError(line, char, state.err!!))
-            }
+            if (state.err != null) return ParseResult.Error(str.posFromOffset(state.offset), state.err!!)
         }
-        if (ret.size == 1 && ret[0] is SExpr.Multi) return Either.Left(ret[0] as SExpr.Multi)
-        else return Either.Left(SExpr.Multi(ret))
+        val retVals = if (ret.size == 1 && ret[0] is SExpr.Multi) (ret[0] as SExpr.Multi).vals else ret
+        return ParseResult.Success(retVals, state.exprOffsetMap)
     }
 
-    private class ParseState(val str: CharSequence, var offset: Int = 0, var err: String? = null) {
+    private class ParseState(
+        val str: CharSequence,
+        var exprOffsetMap: IdentityMap<SExpr, ParseResult.Pos> = IdentityMap(),
+        var offset: Int = 0,
+        var err: String? = null
+    ) {
         fun nextSExpr(): SExpr? {
             skipWhitespace()
             if (isEof) return null
             // What type of expr do we have here?
+            val origOffset = offset
             when (str[offset]) {
                 '(' -> {
                     offset++
@@ -37,6 +44,7 @@ open class StrToSExpr {
                     if (err == null) {
                         if (str[offset] == ')') offset++ else err = "EOF when expected ')'"
                     }
+                    exprOffsetMap += ret to str.posFromOffset(origOffset)
                     return ret
                 }
                 '"' -> {
@@ -74,13 +82,17 @@ open class StrToSExpr {
                     }
                     if (err == null && str[offset] != '"') err = "EOF when expected '\"'"
                     else if (err == null) offset++
-                    return SExpr.Symbol(retStr, true)
+                    val ret = SExpr.Symbol(retStr, true)
+                    exprOffsetMap += ret to str.posFromOffset(origOffset)
+                    return ret
                 }
                 else -> {
                     // Go until next quote or whitespace or parens
-                    val origOffset = offset
                     while (!isEof && !"();\"".contains(str[offset]) && !str[offset].isWhitespace()) offset++
-                    return if (origOffset == offset) null else SExpr.Symbol(str.substring(origOffset, offset))
+                    if (origOffset == offset) return null
+                    val ret = SExpr.Symbol(str.substring(origOffset, offset))
+                    exprOffsetMap += ret to str.posFromOffset(origOffset)
+                    return ret
                 }
             }
         }
@@ -115,6 +127,11 @@ open class StrToSExpr {
         val isEof: Boolean inline get() = offset >= str.length
     }
 
+    fun CharSequence.posFromOffset(offset: Int) = ParseResult.Pos(
+        line = this.substring(0, offset).substringCount("\n") + 1,
+        char = offset - this.lastIndexOf('\n', offset)
+    )
+
     fun CharSequence.substringCount(str: String): Int {
         var lastIndex = 0
         var count = 0

src/main/kotlin/asmble/util/IdentityMap.kt

@@ -0,0 +1,13 @@
+package asmble.util
+
+class IdentityMap<K, V>(override val entries: Set<Map.Entry<K, V>> = emptySet()) : AbstractMap<K, V>() {
+    override fun containsKey(key: K) = entries.find { it.key === key } != null
+    override operator fun get(key: K) = entries.find { it.key === key }?.value
+}
+
+public operator fun <K, V> IdentityMap<K, V>.plus(pair: Pair<K, V>): IdentityMap<K, V> {
+    return IdentityMap(this.entries + object : Map.Entry<K, V> {
+        override val key: K get() = pair.first
+        override val value: V get() = pair.second
+    })
+}

src/test/kotlin/asmble/io/CoreTest.kt

@@ -9,7 +9,11 @@ class CoreTest(val unit: CoreTestUnit) {
 
     @Test
     fun testName() {
-        println("\nYay: ${unit.name}: ${unit.ast}")
+        println()
+        println("AST SExpr: " + unit.ast)
+        println("AST Str: " + SExprToStr.fromSExpr(*unit.ast.toTypedArray()))
+        println("AST: " + unit.script)
+        println("AST Str: " +  SExprToStr.fromSExpr(*AstToSExpr.fromScript(unit.script).toTypedArray()))
     }
 
     companion object {

src/test/kotlin/asmble/io/CoreTestUnit.kt

@@ -1,36 +1,49 @@
 package asmble.io
 
 import asmble.ast.SExpr
-import asmble.util.Either
+import asmble.ast.Script
 import java.nio.file.FileSystems
 import java.nio.file.Files
 import java.nio.file.Paths
 import java.util.stream.Collectors
 
-class CoreTestUnit(val name: String, val ast: SExpr.Multi, val expectedOutput: String?) {
+class CoreTestUnit(val name: String, val wast: String, val expectedOutput: String?) {
 
     override fun toString() = "Spec unit: $name"
 
+    val parseResult: StrToSExpr.ParseResult.Success by lazy {
+        StrToSExpr.parse(wast).let {
+            when (it) {
+                is StrToSExpr.ParseResult.Error -> throw Exception("$name[${it.pos}] Parse fail: ${it.msg}")
+                is StrToSExpr.ParseResult.Success -> it
+            }
+        }
+    }
+
+    val ast: List<SExpr> get() = parseResult.vals
+
+    val script: Script by lazy { SExprToAst.toScript(SExpr.Multi(ast)) }
+
     companion object {
         val unitsPath = "/spec/test/core"
         fun loadAll(): List<CoreTestUnit> {
+            return loadFromResourcePath("/local-spec") + loadFromResourcePath(unitsPath)
+        }
+
+        fun loadFromResourcePath(basePath: String): List<CoreTestUnit> {
+            require(basePath.last() != '/')
             val jcls = CoreTestUnit::class.java
-            val uri = jcls.getResource(unitsPath).toURI()
+            val uri = jcls.getResource(basePath).toURI()
             val fs = if (uri.scheme == "jar") FileSystems.newFileSystem(uri, emptyMap<String, Any>()) else null
             fs.use { fs ->
-                val path = fs?.getPath(unitsPath) ?: Paths.get(uri)
-                return Files.walk(path, 1).filter { it.toString().endsWith(".wast") }.map {
-                    println("Loading $it")
-                    val parseResult = StrToSExpr.parse(it.toUri().toURL().readText())
-                    when(parseResult) {
-                        is Either.Right -> throw Exception("Error loading $it: ${parseResult.v}")
-                        is Either.Left -> {
-                            val name = it.fileName.toString().substringBeforeLast(".wast")
-                            val expectedOutput =
-                                jcls.getResource("/spec/test/core/expected-output/$name.wast.log")?.readText()
-                            CoreTestUnit(name, parseResult.v, expectedOutput)
-                        }
-                    }
+                val path = fs?.getPath(basePath) ?: Paths.get(uri)
+                return Files.walk(path, 1).filter { it.toString().endsWith("address.wast") }.map {
+                    val name = it.fileName.toString().substringBeforeLast(".wast")
+                    CoreTestUnit(
+                        name = name,
+                        wast = it.toUri().toURL().readText(),
+                        expectedOutput = jcls.getResource("$basePath/expected-output/$name.wast.log")?.readText()
+                    )
                 }.collect(Collectors.toList())
             }
         }