From 8784736848d846f40c90c41edeb9162c00d0bdbd Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Fri, 14 Mar 2025 13:38:11 -0700
Subject: ASM printer includes encodings

---
 chapter21/src/main/java/com/seaofnodes/simple/SB.java    |  8 ++++++++
 .../java/com/seaofnodes/simple/codegen/Encoding.java     | 16 ++++++++++++----
 .../java/com/seaofnodes/simple/print/ASMPrinter.java     | 11 ++++++++---
 3 files changed, 28 insertions(+), 7 deletions(-)

(limited to 'chapter21/src/main/java/com/seaofnodes')

diff --git a/chapter21/src/main/java/com/seaofnodes/simple/SB.java b/chapter21/src/main/java/com/seaofnodes/simple/SB.java
index a45f0ddf..72649a39 100644
--- a/chapter21/src/main/java/com/seaofnodes/simple/SB.java
+++ b/chapter21/src/main/java/com/seaofnodes/simple/SB.java
@@ -29,6 +29,14 @@ public final class SB {
   public SB p( int    s ) { _sb.append(s); return this; }
   public SB p( long   s ) { _sb.append(s); return this; }
   public SB p( boolean s) { _sb.append(s); return this; }
+  // 2 hex digits
+  public SB hex2(int s) {
+    int digit = (s>>4) & 0xf;
+    _sb.append((char)((digit <= 9 ? '0' : ('A'-10))+digit));
+    digit = s & 0xf;
+    _sb.append((char)((digit <= 9 ? '0' : ('A'-10))+digit));
+    return this;
+  }
   // 4 hex digits
   public SB hex4(int s) {
     assert (s>>4*4)==0; // Fits in 16 bits
diff --git a/chapter21/src/main/java/com/seaofnodes/simple/codegen/Encoding.java b/chapter21/src/main/java/com/seaofnodes/simple/codegen/Encoding.java
index 50eab8f1..413754b0 100644
--- a/chapter21/src/main/java/com/seaofnodes/simple/codegen/Encoding.java
+++ b/chapter21/src/main/java/com/seaofnodes/simple/codegen/Encoding.java
@@ -35,11 +35,14 @@ public class Encoding {
     // - RIP-relative to external chunks have a zero offset; the matching
     //   relocation info will be used to patch the correct value.
 
-    final ByteArrayOutputStream _bits;
+    public class BAOS extends ByteArrayOutputStream { public byte[] buf() { return buf; } };
+    final public BAOS _bits;
+
+    public byte[] _opLen;
 
     Encoding( CodeGen code ) {
         _code = code;
-        _bits = new ByteArrayOutputStream();
+        _bits = new BAOS();
     }
 
     // Short cut to the defining register
@@ -100,15 +103,20 @@ public class Encoding {
             rpo.swap(i,rpo.size()-1-i);
         visit.clear();
         _code._cfg = rpo;       // Save the new ordering
+        _opLen = new byte[_code.UID()];
 
         // Write encoding bits in order
         for( CFGNode bb : _code._cfg )
             for( Node n : bb._outputs )
-                if( n instanceof MachNode mach )
+                if( n instanceof MachNode mach ) {
+                    int off = _bits.size();
                     mach.encoding(this);
+                    _opLen[n._nid] = (byte)(_bits.size()-off);
+                }
 
+        System.out.println(_code.asm());
         // Patch RIP-relative encodings now
-        throw Utils.TODO();
+        //throw Utils.TODO();
     }
 
     // Basic block layout.  Now that RegAlloc is finished, no more spill code
diff --git a/chapter21/src/main/java/com/seaofnodes/simple/print/ASMPrinter.java b/chapter21/src/main/java/com/seaofnodes/simple/print/ASMPrinter.java
index a7a0bce0..c97d809d 100644
--- a/chapter21/src/main/java/com/seaofnodes/simple/print/ASMPrinter.java
+++ b/chapter21/src/main/java/com/seaofnodes/simple/print/ASMPrinter.java
@@ -124,9 +124,14 @@ public abstract class ASMPrinter {
         sb.p(" ");
 
         // Encoding
-        int size = 1;           // TODO: Fake encoding size
-        iadr += size;
-        sb.fix(encWidth,"??");
+        if( code._encoding != null ) {
+            int size = code._encoding._opLen[n._nid];
+            for( int i=0; i<size; i++ )
+                sb.hex2(code._encoding._bits.buf()[iadr++]);
+            for( int i=size*2; i<encWidth; i++ )
+                sb.p(" ");
+        } else
+            sb.fix(encWidth,"");
         sb.p("  ");
 
         // Op; generally "ld4" or "call"
-- 
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