Add Chapter 29 for tech debt cleanup with the parser splitmain

Keep Chapter 28b intact and carry the grammar-oriented parser package, Var move, IterPeeps move, and parser regression tests into Chapter 29. Defer privacy and exclude its experimental tests and fixture changes.

Register the chapter in the indexes, IntelliJ modules and run configurations, Maven reactor, roadmap, and linear-history publisher. Windows and Linux each pass 573 tests, release builds, 199 allocation replays, and 29 native checks.

1 files changed, 204 insertions, 0 deletions

diff --git a/chapter29/src/test/java/com/seaofnodes/simple/Chapter05Test.java b/chapter29/src/test/java/com/seaofnodes/simple/Chapter05Test.java
new file mode 100644
index 00000000..afdb1071
--- /dev/null
+++ b/chapter29/src/test/java/com/seaofnodes/simple/Chapter05Test.java
@@ -0,0 +1,204 @@
+package com.seaofnodes.simple;
+
+import com.seaofnodes.simple.codegen.CodeGen;
+import com.seaofnodes.simple.node.*;
+import org.junit.Test;
+
+import static org.junit.Assert.*;
+
+public class Chapter05Test {
+
+    @Test
+    public void testIfStmt() {
+        CodeGen code = new CodeGen(
+"""
+int a = 1;
+if (arg == 1)
+    a = arg+2;
+else {
+    a = arg-3;
+}
+return a;
+""");
+        code.driver(CodeGen.Phase.FinalizeIR);
+        assertEquals("return Phi(Region,(arg+2),(arg-3));", code.print());
+    }
+
+    @Test
+    public void testTest() {
+        CodeGen code = new CodeGen(
+"""
+int c = 3;
+int b = 2;
+if (arg == 1) {
+    b = 3;
+    c = 4;
+}
+return c;
+""");
+        code.driver(CodeGen.Phase.FinalizeIR);
+        assertEquals("return Phi(Region,4,3);", code.print());
+    }
+
+    @Test
+    public void testReturn2() {
+        CodeGen code = new CodeGen(
+"""
+if( arg==1 )
+    return 3;
+else
+    return 4;
+""");
+        code.parse();
+        assertEquals("return Phi(Region,3,4);", code.print());
+    }
+
+    @Test
+    public void testIfMergeB() {
+        CodeGen code = new CodeGen(
+"""
+int a=arg+1;
+int b=0;
+if( arg==1 )
+    b=a;
+else
+    b=a+1;
+return a+b;""");
+        code.driver(CodeGen.Phase.FinalizeIR);
+        assertEquals("return ((arg<<1)+Phi(Region,2,3));", code.print());
+    }
+
+    @Test
+    public void testIfMerge2() {
+        CodeGen code = new CodeGen(
+"""
+int a=arg+1;
+int b=arg+2;
+if( arg==1 )
+    b=b+a;
+else
+    a=b+1;
+return a+b;""");
+        code.driver(CodeGen.Phase.FinalizeIR);
+        assertEquals("return ((Phi(Region,(arg<<1),arg)+arg)+Phi(Region,4,5));", code.print());
+    }
+
+    @Test
+    public void testMerge3() {
+        CodeGen code = new CodeGen(
+"""
+int a=1;
+if( arg==1 )
+    if( arg==2 )
+        a=2;
+    else
+        a=3;
+else if( arg==3 )
+    a=4;
+else
+    a=5;
+return a;
+""");
+        code.driver(CodeGen.Phase.FinalizeIR);
+        assertEquals("return Phi(Region,3,5,2,4);", code.print());
+    }
+
+    @Test
+    public void testMerge4() {
+        CodeGen code = new CodeGen(
+"""
+int a=0;
+int b=0;
+if( arg )
+    a=1;
+if( arg==0 )
+    b=2;
+return arg+a+b;
+""");
+        code.driver(CodeGen.Phase.FinalizeIR);
+        String ir = code.print();
+        assertTrue(ir,
+                   ir.equals("return ((arg+Phi(Region,1,0))+Phi(Region,2,0));") ||
+                   ir.equals("return (Phi(Region,((!=0)arg+1),0)+Phi(Region,2,0));"));
+    }
+
+    @Test
+    public void testMerge5() {
+        CodeGen code = new CodeGen(
+"""
+int a=arg==2;
+if( arg==1 )
+{
+    a=arg==3;
+}
+return a;
+""");
+        code.driver(CodeGen.Phase.FinalizeIR);
+        assertEquals("return (arg==Phi(Region,3,2));", code.print());
+    }
+
+    @Test
+    public void testMergeSameCon() {
+        CodeGen code = new CodeGen(
+"""
+int a=arg;
+if( arg==1 )
+    a=3;
+else
+    a=3;
+return a;
+""");
+        code.driver(CodeGen.Phase.FinalizeIR);
+        assertEquals("return 3;", code.print());
+    }
+
+    @Test
+    public void testTrue() {
+      CodeGen code = new CodeGen("return true;").parse();
+      assertEquals("return 1;",code.print());
+    }
+
+    @Test
+    public void testHalfDef() {
+        try { new CodeGen("if( arg==1 ) int b=2; return b;").parse(); fail(); }
+        catch( RuntimeException e ) { assertEquals("Cannot define a 'b' on one arm of an if",e.getMessage()); }
+    }
+
+    @Test
+    public void testHalfDef2() {
+        try { new CodeGen("if( arg==1 ) { int b=2; } else { int b=3; } return b;").parse(); fail(); }
+        catch( RuntimeException e ) { assertEquals("Undefined name 'b'",e.getMessage()); }
+    }
+
+    @Test
+    public void testRegress1() {
+        try { new CodeGen("if(arg==2) int a=1; else int b=2; return a;").parse(); fail(); }
+        catch( RuntimeException e ) { assertEquals("Cannot define a 'a' on one arm of an if",e.getMessage()); }
+    }
+
+
+    @Test
+    public void testBadNum() {
+        try { new CodeGen("return 1-;").parse();  fail(); }
+        catch( RuntimeException e ) { assertEquals("Syntax error, expected `an identifier or expression` but found `;`",e.getMessage()); }
+    }
+
+    @Test
+    public void testKeyword1() {
+        try { new CodeGen("int true=0; return true;").parse(); fail(); }
+        catch( RuntimeException e ) { assertEquals("Expected an identifier, found 'true'",e.getMessage()); }
+    }
+
+    @Test
+    public void testKeyword2() {
+        try { new CodeGen("int else=arg; if(else) else=2; else else=1; return else;").parse(); fail(); }
+        catch( RuntimeException e ) { assertEquals("Expected an identifier, found 'else'",e.getMessage()); }
+    }
+
+    @Test
+    public void testKeyword3() {
+        try { new CodeGen("int a=1; ififif(arg);a=2;return a;").parse(); fail(); }
+        catch( RuntimeException e ) { assertEquals("Undefined name 'ififif'",e.getMessage()); }
+    }
+
+}