Name

src/IKVM.ByteCode.Tests/Decoding/CodeAttributeTests.cs

@@ -0,0 +1,62 @@
+using System.Buffers;
+using System.Buffers.Binary;
+
+using FluentAssertions;
+
+using IKVM.ByteCode.Buffers;
+using IKVM.ByteCode.Decoding;
+using IKVM.ByteCode.Encoding;
+using IKVM.ByteCode.Text;
+
+using Microsoft.VisualStudio.TestTools.UnitTesting;
+
+namespace IKVM.ByteCode.Tests.Decoding
+{
+
+    [TestClass]
+    public class CodeAttributeTests
+    {
+
+        [TestMethod]
+        public void CanRewriteLoadConstant()
+        {
+            var int32 = new byte[4];
+            BinaryPrimitives.WriteInt32BigEndian(int32, 1234);
+
+            var codeName = new byte[6];
+            BinaryPrimitives.WriteInt16BigEndian(codeName, 4);
+            MUTF8Encoding.GetMUTF8(50).GetBytes("Code").CopyTo(codeName, 2);
+
+            var constants = new ConstantTable(new ClassFormatVersion(50, 0), [
+                new(ConstantKind.Unknown, new ReadOnlySequence<byte>()),
+                new(ConstantKind.Integer, new ReadOnlySequence<byte>(int32)),
+                new(ConstantKind.Utf8, new ReadOnlySequence<byte>(codeName)),
+            ]);
+
+            var codeBuffer1 = new BlobBuilder();
+            var excpBuffer1 = new BlobBuilder();
+            new CodeBuilder(codeBuffer1)
+                .DefineLabel(out var end)
+                .BeginExceptionBlock(ClassConstantHandle.Nil, out var handler)
+                    .LoadConstant(new IntegerConstantHandle(1))
+                    .Pop()
+                .EndExceptionBlock()
+                .MarkLabel(handler)
+                .MarkLabel(end)
+                .Return()
+                .SerializeExceptions(excpBuffer1);
+
+            // fake up a code attribute
+            var excpReader1 = new ClassFormatReader(excpBuffer1.ToArray());
+            ExceptionHandlerTable.TryRead(ref excpReader1, out var excpTable1).Should().BeTrue();
+            var codeAttr1 = new CodeAttribute(10, 10, new ReadOnlySequence<byte>(codeBuffer1.ToArray()), excpTable1, new AttributeTable([]));
+
+            // copy code attribute to new attribute table encoder
+            var attrTable2 = new BlobBuilder();
+            var attrEncoder2 = new AttributeTableEncoder(attrTable2);
+            codeAttr1.CopyTo(constants, constants, ref attrEncoder2);
+        }
+
+    }
+
+}

src/IKVM.ByteCode/Encoding/ConstantBuilder.cs

@@ -2,6 +2,7 @@
 using System.Collections.Generic;
 
 using IKVM.ByteCode.Buffers;
+using IKVM.ByteCode.Decoding;
 using IKVM.ByteCode.Text;
 
 namespace IKVM.ByteCode.Encoding