From 7edca9823ec8ef0aed10c88fa07ef969792aab77 Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Mon, 19 Oct 2026 14:56:14 -0700
Subject: Split from ch25, SCCP and interprocedural SCCP

---
 .../java/com/seaofnodes/simple/SpillStats.java     | 73 ++++++++++++++++++++++
 1 file changed, 73 insertions(+)
 create mode 100644 chapter-interprocedural-sccp/src/test/java/com/seaofnodes/simple/SpillStats.java

(limited to 'chapter-interprocedural-sccp/src/test/java/com/seaofnodes/simple/SpillStats.java')

diff --git a/chapter-interprocedural-sccp/src/test/java/com/seaofnodes/simple/SpillStats.java b/chapter-interprocedural-sccp/src/test/java/com/seaofnodes/simple/SpillStats.java
new file mode 100644
index 00000000..ad044a52
--- /dev/null
+++ b/chapter-interprocedural-sccp/src/test/java/com/seaofnodes/simple/SpillStats.java
@@ -0,0 +1,73 @@
+package com.seaofnodes.simple;
+
+import com.seaofnodes.simple.codegen.CodeGen;
+import java.util.Map;
+import java.util.TreeMap;
+import org.junit.runner.*;
+import org.junit.runner.notification.*;
+
+// Run existing tests and sum actual allocations, including ones without goldens.
+// Helpers call record after allocation; ordinary JUnit runs collect nothing.
+public class SpillStats extends RunListener {
+    private static SpillStats ACTIVE;
+    private Description _test;
+    private int _qualityFailures;
+    private final Map<String,long[]> _totals = new TreeMap<>();
+
+    @Override public void testStarted(Description test) { _test = test; }
+    public static void record(CodeGen code, String cohort, String cpu, String abi) {
+        if( ACTIVE==null ) return;
+        String test = ACTIVE._test.getTestClass().getSimpleName()+"."+ACTIVE._test.getMethodName();
+        for( String key : new String[]{cohort+","+cpu+","+abi,cohort+",ALL,ALL"} ) {
+            long[] sum = ACTIVE._totals.computeIfAbsent(key,k -> new long[3]);
+            sum[0]++; sum[1] += code._regAlloc._spills; sum[2] += code._regAlloc._spillScaled;
+        }
+        System.out.println("allocation,"+cohort+","+test+","+cpu+","+abi+","+
+                           code._regAlloc._spills+","+code._regAlloc._spillScaled);
+    }
+
+    // The same native helpers serve old and new program cohorts.
+    public static void recordNative(CodeGen code, String cpu, String abi) {
+        String cohort = ACTIVE!=null && (ACTIVE._test.getTestClass()==Chapter24Test.class || ACTIVE._test.getTestClass()==Chapter24AllocTest.class)
+            ? "Chapter24" : ACTIVE!=null && ACTIVE._test.getTestClass()==Chapter23Test.class
+            ? "Chapter23" : ACTIVE!=null && ACTIVE._test.getTestClass()==Chapter22Test.class
+            ? "Chapter22" : "Chapter21";
+        record(code,cohort,cpu,abi);
+    }
+
+    // Keep running every CPU and native result check when measuring quality.
+    // A changed golden still makes spill-stats fail at the end.
+    public static void checkSpills(int expected, int actual) {
+        if( expected==-1 ) return;
+        try { org.junit.Assert.assertEquals("Expect spills:",expected,actual,Math.max(1,expected>>3)); }
+        catch( AssertionError error ) {
+            if( ACTIVE==null ) throw error;
+            ACTIVE._qualityFailures++;
+            System.err.println(ACTIVE._test+": "+error.getMessage());
+        }
+    }
+
+    public static void main(String[] args) throws ClassNotFoundException {
+        if( args.length==0 ) args = new String[]{"Chapter20Test","Chapter21Test","Chapter21AllocTest","Chapter22Test","Chapter23Test","Chapter23AllocTest","Chapter24Test","Chapter24AllocTest","BrainFuckTest","MergeSortTest"};
+        Class<?>[] tests = new Class<?>[args.length];
+        for( int i=0; i<args.length; i++ )
+            tests[i] = Class.forName("com.seaofnodes.simple."+args[i]);
+        ACTIVE = new SpillStats();
+        JUnitCore junit = new JUnitCore();
+        junit.addListener(ACTIVE);
+        Result result = junit.run(tests);
+        boolean passed = result.wasSuccessful() && ACTIVE._qualityFailures==0;
+        if( !result.wasSuccessful() ) System.out.println("FAILED test run: totals are not a complete comparison.");
+        else if( !passed ) System.out.println("Spill expectations differ; allocation and runtime checks passed.");
+        System.out.println("cohort,cpu,abi,allocations,splits,scaled");
+        for( var row : ACTIVE._totals.entrySet() ) {
+            long[] sum = row.getValue();
+            System.out.println(row.getKey()+","+sum[0]+","+sum[1]+","+sum[2]);
+        }
+        for( Failure failure : result.getFailures() ) System.err.println(failure.getTrace());
+        System.out.println("Tests: "+result.getRunCount()+", failures: "+result.getFailureCount());
+        System.out.println("Spill golden failures: "+ACTIVE._qualityFailures);
+        ACTIVE = null;
+        if( !passed ) System.exit(1);
+    }
+}
-- 
cgit v1.2.3