checkpointstability-rewrite

1 files changed, 60 insertions, 0 deletions

diff --git a/Q1.core/Pipeline/AssemblerBlock.cs b/Q1.core/Pipeline/AssemblerBlock.cs
new file mode 100644
index 0000000..e40cbec
--- /dev/null
+++ b/Q1.core/Pipeline/AssemblerBlock.cs
@@ -0,0 +1,60 @@
+namespace Q1.core.Pipeline;
+
+public class AssemblerBlock
+{
+    private readonly MemoryStream _stream = new();
+    public readonly Dictionary<i64, (bool word, string constant)> DeferredConstants = new();
+    
+    public long Size => this._stream.Length;
+    
+    public void WriteByte(u8 data)
+    {
+        this._stream.WriteByte(data);
+    }
+
+    public void WriteWord(u16 data)
+    {
+        u8 high = (u8) (data       & 0xFF);
+        u8 low = (u8) ((data >> 8) & 0xFF);
+        this._stream.WriteByte(low);
+        this._stream.WriteByte(high);
+    }
+
+    public void DeferWordConstant(string constant)
+    {
+        this.DeferredConstants.Add(this._stream.Length - 1, (true, constant));
+        this.WriteWord(0);
+    }
+    
+    public void DeferByteConstant(string constant)
+    {
+        this.DeferredConstants.Add(this._stream.Length - 1, (false, constant));
+        this.WriteByte(0);
+    }
+    
+    public void ResolveWordConstant(i32 offset, u16 value)
+    {
+        long currentPos = this._stream.Position;
+        this._stream.Position = offset;
+        
+        this.WriteWord(value);
+        
+        this._stream.Position = currentPos;
+    }
+    
+    public void ResolveByteConstant(i32 offset, u8 value)
+    {
+        long currentPos = this._stream.Position;
+        this._stream.Position = offset;
+        
+        this.WriteByte(value);
+        
+        this._stream.Position = currentPos;
+    }
+    
+    public void WriteToStream(MemoryStream target)
+    {
+        this._stream.Position = 0;
+        this._stream.CopyTo(target);
+    }
+}
\ No newline at end of file