Chapter 26: Construction and Private Memorylinear-chapter26

Co-authored-by: Hsiang-Ying Fu <66062782+fuhsnn@users.noreply.github.com>
Co-authored-by: fuhsnn <66062782+fuhsnn@users.noreply.github.com>
Co-authored-by: Symious <14933944+symious@users.noreply.github.com>
Co-authored-by: Jun Kawasaki <jun784@gmail.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

1 files changed, 63 insertions, 0 deletions

diff --git a/src/test/java/com/seaofnodes/simple/FinalConstructionTest.java b/src/test/java/com/seaofnodes/simple/FinalConstructionTest.java
new file mode 100644
index 00000000..e91dc384
--- /dev/null
+++ b/src/test/java/com/seaofnodes/simple/FinalConstructionTest.java
@@ -0,0 +1,63 @@
+package com.seaofnodes.simple;
+
+import com.seaofnodes.simple.codegen.CodeGen;
+import com.seaofnodes.simple.node.StoreNode;
+import org.junit.Test;
+import static org.junit.Assert.*;
+
+public class FinalConstructionTest {
+    private static final String LOOP = """
+        val step={int x -> x*2+1;};
+        struct C {
+            val x=1;
+            new C={int n ->
+                x=0; x=1;
+                for(int i=0; i<n; i++) x=step(x);
+            };
+            val get={->x;};
+        };
+        return new C(arg).get();
+        """;
+
+    @Test public void testFinalConstructorLocals() throws java.io.IOException {
+        var code=new CodeGen(LOOP).driver(CodeGen.Phase.LocalSched);
+        assertEquals("1",Eval2.eval(code,0));
+        assertEquals("15",Eval2.eval(code,3));
+        assertEquals("63",Eval2.eval(code,5));
+        code._stop.walk(n -> {
+            if( n instanceof StoreNode st && st._name.equals("x") )
+                assertEquals("Final field writes belong after the loop",0,st.cfg0().loopDepth());
+            return null;
+        });
+        String[] sources={
+            "struct C { val x=1; new C={->x=1; x=2;}; }; return new C().x;",
+            "struct C { int ~x; new C={int n -> self.x=1; for(int i=0;i<n;i++) self.x*=2;}; }; return new C(arg).x;",
+            "struct C { val x=1; new C={int n -> for(int i=0;i<n;i++) ++x;}; }; return new C(arg).x;",
+            "struct C { val x=1.5; new C={->x=2.5;}; }; return new C().x;",
+            "struct C { val x=\"a\"; new C={int n -> for(int i=0;i<n;i++) x=\"b\";}; }; return new C(arg).x[0];",
+            "struct C { val x=new int[1]; new C={->x=new int[2]; x=new int[3];}; }; return new C().x#;"
+        };
+        String[] results={"2","8","4","2.5","98","3"};
+        for( int i=0; i<sources.length; i++ )
+            assertEquals(results[i],Eval2.eval(new CodeGen(sources[i]).driver(CodeGen.Phase.TypeCheck),3));
+
+        String[] rejected={
+            "struct C { val x=1; }; val c=new C(); c.x=2; return c.x;",
+            "struct C { new C={->val x=1; x=2;}; }; return new C();",
+            "struct C { val f={->1;}; new C={->f={->2;};}; }; return new C().f();"
+        };
+        for( String src : rejected ) {
+            try { new CodeGen(src).driver(CodeGen.Phase.TypeCheck); fail(src); }
+            catch( Parser.ParseException e ) { assertTrue(e.getMessage(),e.getMessage().startsWith("Cannot")); }
+        }
+
+        var dir=java.nio.file.Path.of("build/objs");
+        java.nio.file.Files.createDirectories(dir);
+        java.nio.file.Files.writeString(dir.resolve("finalConstruction.smp"),"val buildFinal={int arg ->"+LOOP+"};");
+        java.nio.file.Files.writeString(dir.resolve("finalConstruction.c"),"""
+            extern long long buildFinal(long long);
+            int main(void) { return buildFinal(0)!=1 || buildFinal(3)!=15 || buildFinal(5)!=63; }
+            """);
+        TestC.run("build/objs","finalConstruction","",-1);
+    }
+}