Implement Ion 1.0 byte-array-backed bytecode generator

src/main/java/com/amazon/ion/bytecode/bin10/TypeIdHelper.kt

@@ -80,11 +80,11 @@ internal object TypeIdHelper {
             in 0xA0..0xAF -> OperationKind.BLOB
             in 0xB0..0xBF -> OperationKind.LIST
             in 0xC0..0xCF -> OperationKind.SEXP
-            0xD0, in 0xD2..0xDF -> OperationKind.STRUCT
+            in 0xD0..0xDF -> OperationKind.STRUCT
             0xE0 -> OperationKind.IVM
             in 0xE3..0xEE -> OperationKind.ANNOTATIONS
             // Everything else: 12..1E, 30, D1, EF, F0..FF, illegal timestamp, float, and annotations sizes
-            else -> OperationKind.UNSET
+            else -> -1
         }
     }
 
@@ -107,28 +107,31 @@ internal object TypeIdHelper {
             // The length of all of these is determined entirely by the low-nibble of the typeId.
             0x00, 0x10, 0x20, 0x30, 0x40, 0x50, /* */ 0x70, 0x80, 0x90, 0xA0, 0xB0, 0xC0, 0xD0 /* */ -> 0
             0x01, /* */ 0x21, 0x31, /* */ 0x51, /* */ 0x71, 0x81, 0x91, 0xA1, 0xB1, 0xC1 /* */ /* */ -> 1
-            0x02, 0x12, 0x22, 0x32, /* */ 0x52, 0x62, 0x72, 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2 /* */ -> 2
-            0x03, 0x13, 0x23, 0x33, /* */ 0x53, 0x63, 0x73, 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3 -> 3
-            0x04, 0x14, 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4 -> 4
-            0x05, 0x15, 0x25, 0x35, /* */ 0x55, 0x65, 0x75, 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5 -> 5
-            0x06, 0x16, 0x26, 0x36, /* */ 0x56, 0x66, 0x76, 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6 -> 6
-            0x07, 0x17, 0x27, 0x37, /* */ 0x57, 0x67, 0x77, 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7 -> 7
-            0x08, 0x18, 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8 -> 8
-            0x09, 0x19, 0x29, 0x39, /* */ 0x59, 0x69, 0x79, 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9 -> 9
-            0x0A, 0x1A, 0x2A, 0x3A, /* */ 0x5A, 0x6A, 0x7A, 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA -> 10
-            0x0B, 0x1B, 0x2B, 0x3B, /* */ 0x5B, 0x6B, 0x7B, 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB -> 11
-            0x0C, 0x1C, 0x2C, 0x3C, /* */ 0x5C, 0x6C, 0x7C, 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC -> 12
-            0x0D, 0x1D, 0x2D, 0x3D, /* */ 0x5D, 0x6D, 0x7D, 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED -> 13
-            0x0E, 0x1E, 0x2E, 0x3E, /* */ 0x5E, 0x6E, 0x7E, 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE -> -1
+            0x02, /* */ 0x22, 0x32, /* */ 0x52, 0x62, 0x72, 0x82, 0x92, 0xA2, 0xB2, 0xC2, 0xD2 /* */ -> 2
+            0x03, /* */ 0x23, 0x33, /* */ 0x53, 0x63, 0x73, 0x83, 0x93, 0xA3, 0xB3, 0xC3, 0xD3, 0xE3 -> 3
+            0x04, /* */ 0x24, 0x34, 0x44, 0x54, 0x64, 0x74, 0x84, 0x94, 0xA4, 0xB4, 0xC4, 0xD4, 0xE4 -> 4
+            0x05, /* */ 0x25, 0x35, /* */ 0x55, 0x65, 0x75, 0x85, 0x95, 0xA5, 0xB5, 0xC5, 0xD5, 0xE5 -> 5
+            0x06, /* */ 0x26, 0x36, /* */ 0x56, 0x66, 0x76, 0x86, 0x96, 0xA6, 0xB6, 0xC6, 0xD6, 0xE6 -> 6
+            0x07, /* */ 0x27, 0x37, /* */ 0x57, 0x67, 0x77, 0x87, 0x97, 0xA7, 0xB7, 0xC7, 0xD7, 0xE7 -> 7
+            0x08, /* */ 0x28, 0x38, 0x48, 0x58, 0x68, 0x78, 0x88, 0x98, 0xA8, 0xB8, 0xC8, 0xD8, 0xE8 -> 8
+            0x09, /* */ 0x29, 0x39, /* */ 0x59, 0x69, 0x79, 0x89, 0x99, 0xA9, 0xB9, 0xC9, 0xD9, 0xE9 -> 9
+            0x0A, /* */ 0x2A, 0x3A, /* */ 0x5A, 0x6A, 0x7A, 0x8A, 0x9A, 0xAA, 0xBA, 0xCA, 0xDA, 0xEA -> 10
+            0x0B, /* */ 0x2B, 0x3B, /* */ 0x5B, 0x6B, 0x7B, 0x8B, 0x9B, 0xAB, 0xBB, 0xCB, 0xDB, 0xEB -> 11
+            0x0C, /* */ 0x2C, 0x3C, /* */ 0x5C, 0x6C, 0x7C, 0x8C, 0x9C, 0xAC, 0xBC, 0xCC, 0xDC, 0xEC -> 12
+            0x0D, /* */ 0x2D, 0x3D, /* */ 0x5D, 0x6D, 0x7D, 0x8D, 0x9D, 0xAD, 0xBD, 0xCD, 0xDD, 0xED -> 13
+            0x0E, /* */ 0x2E, 0x3E, /* */ 0x5E, 0x6E, 0x7E, 0x8E, 0x9E, 0xAE, 0xBE, 0xCE, 0xDE, 0xEE -> -1
             // Bool True
             0x11 -> 0
             // Nulls
             0x0F, 0x1F, 0x2F, 0x3F, 0x4F, 0x5F, 0x6F, 0x7F, 0x8F, 0x9F, 0xAF, 0xBF, 0xCF, 0xDF -> 0
             // IVM
             0xE0 -> 3 // ...3 more than the typeId byte.
+            // Sorted struct
+            0xD1 -> -1
 
             // Reserved and/or illegal typeIds
-            0xEF, 0x60, 0x61, 0xD1, 0xE1, 0xE2,
+            0xEF, 0x60, 0x61, 0xE1, 0xE2,
+            in 0x12..0x1E,
             in 0x41..0x4E, // Illegal float lengths. 0x44 and 0x48 are trapped in the earlier condition.
             in 0xF0..0xFF -> -2
             else -> TODO("This should be unreachable: ${typeId.toHexString()}")

src/main/java/com/amazon/ion/bytecode/bin10/ValueHelpers.kt

@@ -121,6 +121,7 @@ internal fun readTimestampReference(valueBytes: ByteArray, position: Int, length
  * Reads a Decimal value from the given byte array.
  */
 internal fun readDecimalReference(valueBytes: ByteArray, position: Int, end: Int): Decimal {
+    if (position >= end) return Decimal.ZERO
     var p = position
     val exponentValueAndLength = VarIntHelper.readVarIntValueAndLength(valueBytes, p)
     p += exponentValueAndLength.toInt() and 0xFF

src/test/java/com/amazon/ion/bytecode/GeneratorTestUtil.kt

@@ -14,6 +14,8 @@ import org.junit.jupiter.api.assertThrows
 
 object GeneratorTestUtil {
 
+    internal fun BytecodeGenerator.shouldGenerate(vararg expectedBytecode: Int) = shouldGenerate(expectedBytecode)
+
     internal fun BytecodeGenerator.shouldGenerate(
         expectedBytecode: IntArray,
         expectedConstantPool: ConstantPool? = null,
@@ -23,7 +25,7 @@ object GeneratorTestUtil {
 
         val generator = this
 
-        val outputBytecode = BytecodeBuffer()
+        val outputBytecode = BytecodeBuffer(256)
         val constantPool = ConstantPool(32)
 
         val macroIndices = mutableListOf(0)