From fcce1e13814a02d8358eae9a40e33a7e6f2b5400 Mon Sep 17 00:00:00 2001
From: Cliff Click <cliffc@acm.org>
Date: Fri, 13 Jun 2025 15:42:08 -0700
Subject: Unifying Structs and Arrays

---
 .../java/com/seaofnodes/simple/Chapter17Test.java  | 556 ---------------------
 1 file changed, 556 deletions(-)
 delete mode 100644 src/test/java/com/seaofnodes/simple/Chapter17Test.java

(limited to 'src/test/java/com/seaofnodes/simple/Chapter17Test.java')

diff --git a/src/test/java/com/seaofnodes/simple/Chapter17Test.java b/src/test/java/com/seaofnodes/simple/Chapter17Test.java
deleted file mode 100644
index 53c23ecd..00000000
--- a/src/test/java/com/seaofnodes/simple/Chapter17Test.java
+++ /dev/null
@@ -1,556 +0,0 @@
-package com.seaofnodes.simple;
-
-import com.seaofnodes.simple.codegen.CodeGen;
-import org.junit.Test;
-import static org.junit.Assert.assertEquals;
-import static org.junit.Assert.fail;
-
-public class Chapter17Test {
-
-    @Test
-    public void testJig() {
-        CodeGen code = new CodeGen(
-"""
-return 1;
-""");
-        code.parse().opto().typeCheck();
-        assertEquals("return 1;", code.print());
-        assertEquals("1", Eval2.eval(code,  0));
-    }
-
-
-    // ---------------------------------------------------------------
-    @Test
-    public void testInc0() {
-        CodeGen code = new CodeGen("""
-return arg++;
-""");
-        code.parse().opto();
-        assertEquals("return arg;", code.print());
-        assertEquals("0", Eval2.eval(code, 0));
-    }
-
-    @Test
-    public void testInc1() {
-        CodeGen code = new CodeGen("""
-return arg+++arg++;
-""");
-        code.parse().opto();
-        assertEquals("return ((arg<<1)+1);", code.print());
-        assertEquals("1", Eval2.eval(code, 0));
-    }
-
-    @Test
-    public void testInc2() {
-        CodeGen code = new CodeGen("""
-//   -(arg--)-(arg--)
-return -arg---arg--;
-""");
-        code.parse().opto();
-        assertEquals("return (-((arg<<1)+-1));", code.print());
-        assertEquals("1", Eval2.eval(code, 0));
-    }
-
-    @Test
-    public void testInc3() {
-        CodeGen code = new CodeGen("""
-int[] !xs = new int[arg];
-xs[0]++;
-xs[1]++;
-return xs[0];
-""");
-        code.parse().opto();
-        assertEquals("return 1;", code.print());
-        assertEquals("1", Eval2.eval(code, 2));
-    }
-
-    @Test
-    public void testInc4() {
-        CodeGen code = new CodeGen("""
-u8[] !xs = new u8[1];
-xs[0]--;
-return xs[0];
-""");
-        code.parse().opto();
-        assertEquals("return 255;", code.print());
-        assertEquals("255", Eval2.eval(code, 2));
-    }
-
-    @Test
-    public void testInc5() {
-        CodeGen code = new CodeGen("""
-struct S { u16 x; };
-S !s = new S;
-s.x--;
-return s.x;
-""");
-        code.parse().opto();
-        assertEquals("return 65535;", code.print());
-        assertEquals("65535", Eval2.eval(code, 2));
-    }
-
-    @Test
-    public void testInc6() {
-        CodeGen code = new CodeGen("return --arg;");
-        code.parse().opto();
-        assertEquals("return (arg+-1);", code.print());
-        assertEquals("-1", Eval2.eval(code, 0));
-    }
-
-    @Test
-    public void testInc7() {
-        CodeGen code = new CodeGen("u8 x=0; return --x;");
-        code.parse().opto();
-        assertEquals("return 255;", code.print());
-        assertEquals("255", Eval2.eval(code, 0));
-    }
-
-    @Test
-    public void testInc8() {
-        CodeGen code = new CodeGen("int x; x+=2; return x+=3;");
-        code.parse().opto();
-        assertEquals("return 5;", code.print());
-        assertEquals("5", Eval2.eval(code, 0));
-    }
-
-    @Test
-    public void testInc9() {
-        CodeGen code = new CodeGen("flt x = 1.5; x++; return x;");
-        code.parse().opto();
-        assertEquals("return 2.5f;", code.print());
-        assertEquals("2.5", Eval2.eval(code, 0));
-    }
-
-    @Test public void testInt10() {
-        CodeGen code = new CodeGen("flt x = 1.5; x++; int i = x; return i;");
-        try { code.parse().opto().typeCheck(); fail(); }
-        catch( Exception e ) { assertEquals("Type 2.5f is not of declared type i64",e.getMessage()); }
-    }
-
-
-    // ---------------------------------------------------------------
-    @Test public void testVar0() {
-        CodeGen code = new CodeGen("var d; return d;");
-        try { code.parse().opto(); fail(); }
-        catch( Exception e ) { assertEquals("Syntax error, expected =expression: ;",e.getMessage()); }
-    }
-
-    @Test public void testVar1() {
-        CodeGen code = new CodeGen("val d; return d;");
-        try { code.parse().opto(); fail(); }
-        catch( Exception e ) { assertEquals("Syntax error, expected =expression: ;",e.getMessage()); }
-    }
-
-    @Test public void testVar2() {
-        CodeGen code = new CodeGen("int x; x=3; x++; return x; // Ok, no initializer so x is mutable ");
-        code.parse().opto();
-        assertEquals("return 4;", code.print());
-        assertEquals("4", Eval2.eval(code, 0));
-    }
-
-    @Test public void testVar3() {
-        CodeGen code = new CodeGen("int x=3; x++; return x; // Ok, primitive so x is mutable despite initializer ");
-        code.parse().opto();
-        assertEquals("return 4;", code.print());
-        assertEquals("4", Eval2.eval(code, 0));
-    }
-
-    @Test public void testVar4() {
-        CodeGen code = new CodeGen("struct S{int x;}; S? s; s=new S; s.x++; return s.x; // Ok, no initializer so x is mutable ");
-        code.parse().opto();
-        assertEquals("return 1;", code.print());
-        assertEquals("1", Eval2.eval(code, 0));
-    }
-
-    @Test public void testVar5() {
-        CodeGen code = new CodeGen("struct S{int x;}; S? s; s=new S{x=3;}; s.x++; return s.x; // Ok, no initializer so x is mutable ");
-        code.parse().opto();
-        assertEquals("return 4;", code.print());
-        assertEquals("4", Eval2.eval(code, 0));
-    }
-
-    @Test public void testVar6() {
-        CodeGen code = new CodeGen("struct S{int x;}; val s = new S; s.x++; return s.x; // Error initializer so x is immutable ");
-        try { code.parse().opto().typeCheck(); fail(); }
-        catch( Exception e ) { assertEquals("Cannot modify final field 'x'",e.getMessage()); }
-    }
-
-    @Test public void testVar7() {
-        CodeGen code = new CodeGen("struct S{int x;}; val s = new S{x=3;}; s.x++; return s.x; // Error initializer so x is immutable ");
-        try { code.parse().opto().typeCheck(); fail(); }
-        catch( Exception e ) { assertEquals("Cannot modify final field 'x'",e.getMessage()); }
-    }
-
-    @Test public void testVar8() {
-        CodeGen code = new CodeGen("struct S{int x;}; S !s=new S; s.x++; return s.x; // Ok, has '!' so s.x is mutable ");
-        code.parse().opto();
-        assertEquals("return 1;", code.print());
-        assertEquals("1", Eval2.eval(code, 0));
-    }
-
-    @Test public void testVar9() {
-        CodeGen code = new CodeGen("struct S{int x;}; var s=new S; s.x++; return s.x; // Ok, has var so s.x is mutable ");
-        code.parse().opto();
-        assertEquals("return 1;", code.print());
-        assertEquals("1", Eval2.eval(code, 0));
-    }
-
-    @Test public void testVar10() {
-        CodeGen code = new CodeGen("struct S{int x;}; val s=new S; s.x++; return s.x; // Error, has val so x is immutable ");
-        try { code.parse().opto().typeCheck(); fail(); }
-        catch( Exception e ) { assertEquals("Cannot modify final field 'x'",e.getMessage()); }
-    }
-
-    @Test public void testVar11() {
-        CodeGen code = new CodeGen("""
-struct Bar { int x; };
-Bar !bar = new Bar;
-bar.x = 3; // Ok, bar is mutable
-
-struct Foo { Bar? !bar; int y; };
-Foo !foo = new Foo { bar = bar; };
-foo.bar = bar; // Ok foo is mutable
-foo.bar.x++;   // Ok foo and foo.bar and foo.bar.x are all mutable
-
-val xfoo = foo; // Throw away mutability
-xfoo.bar.x++;   // Error, cannot mutate through xfoo
-return xfoo.bar.x;
- """);
-        try { code.parse().opto().typeCheck(); fail(); }
-        catch( Exception e ) { assertEquals("Cannot modify final field 'x'",e.getMessage()); }
-    }
-
-    @Test public void testVar12() {
-        CodeGen code = new CodeGen("""
-struct Bar { int x; };
-Bar !bar = new Bar;
-bar.x = 3; // Ok, bar is mutable
-
-struct Foo { Bar? !bar; int y; };
-Foo !foo = new Foo;
-foo.bar = bar; // Ok bar is mutable
-foo.bar.x++;   // Ok foo and foo.bar and foo.bar.x are all mutable
-
-val xfoo = foo;        // Throw away mutability
-int x4 = xfoo.bar.x;   // Ok to read through xfoo, gets 4
-foo.bar.x++;           // Bumps to 5
-int x5 = xfoo.bar.x;   // Ok to read through xfoo, gets 5
-return x4*10+x5;
-""");
-        code.parse().opto();
-        assertEquals("return 45;", code.print());
-        assertEquals("45", Eval2.eval(code, 0));
-    }
-
-    @Test
-    public void testVar13() {
-        CodeGen code = new CodeGen("""
-int i,i++;
-""");
-        try { code.parse().opto().typeCheck(); fail(); }
-        catch( Exception e ) { assertEquals("Redefining name 'i'",e.getMessage()); }
-    }
-
-
-    @Test
-    public void testVar14() {
-        CodeGen code = new CodeGen("""
-struct B {};
-struct A { B b; };
-A x = new A {
-    return b; // read before init
-    b = new B;
-};
-""");
-        try { code.parse().opto(); fail(); }
-        catch( Exception e ) { assertEquals("Cannot read uninitialized field 'b'",e.getMessage()); }
-    }
-
-    @Test
-    public void testVar15() {
-        CodeGen code = new CodeGen("""
-struct B {};
-struct A { B b; };
-return new A {
-    if (arg) b = new B; // Constructor ends with partial init of b
-}.b;
-""");
-        try { code.parse(); fail(); }
-        catch( Exception e ) { assertEquals("'A' is not fully initialized, field 'b' needs to be set in a constructor",e.getMessage()); }
-    }
-
-    @Test
-    public void testVar16() {
-        CodeGen code = new CodeGen(
-"""
-struct S{};
-val x = 1;
-val s = new S{x = 2;};
-return x;
-"""
-);
-        try { code.parse().opto().typeCheck(); fail(); }
-        catch( Exception e ) { assertEquals("Cannot reassign final 'x'",e.getMessage()); }
-    }
-
-    @Test
-    public void testVar17() {
-        CodeGen code = new CodeGen(
-"""
-struct Person {
-    bool focused;
-};
-val focus = { Person p ->
-    p.focused = true;
-};
-Person me; // Person !me = new Person;
-focus(me);
-return me;
-"""
-);
-        try { code.parse(); fail(); }
-        catch( Exception e ) { assertEquals("Syntax error, expected =expression: ;",e.getMessage()); }
-    }
-
-    // ---------------------------------------------------------------
-    @Test
-    public void testTrinary0() {
-        CodeGen code = new CodeGen("""
-return arg ? 1 : 2;
-""");
-        code.parse().opto();
-        assertEquals("return Phi(Region,1,2);", code.print());
-        assertEquals("2", Eval2.eval(code, 0));
-        assertEquals("1", Eval2.eval(code, 1));
-    }
-
-    @Test
-    public void testTrinary1() {
-        CodeGen code = new CodeGen("""
-return arg ? 0 : arg;
-""");
-        code.parse().opto();
-        assertEquals("return 0;", code.print());
-        assertEquals("0", Eval2.eval(code, 0));
-    }
-
-    @Test
-    public void testTrinary2() {
-        CodeGen code = new CodeGen("""
-struct Bar { int x; };
-var b = arg ? new Bar : null;
-return b ? b.x++ + b.x++ : -1;
-""");
-        code.parse().opto();
-        assertEquals("return Phi(Region,((.x<<1)+1),-1);", code.print());
-        assertEquals("-1", Eval2.eval(code, 0));
-        assertEquals("1", Eval2.eval(code, 1));
-    }
-
-    @Test
-    public void testTrinary3() {
-        CodeGen code = new CodeGen("""
-struct Bar { int x; };
-var b = arg ? new Bar;
-return b ? b.x++ + b.x++ : -1;
-""");
-        code.parse().opto();
-        assertEquals("return Phi(Region,((.x<<1)+1),-1);", code.print());
-        assertEquals("-1", Eval2.eval(code, 0));
-        assertEquals("1", Eval2.eval(code, 1));
-    }
-
-    @Test
-    public void testTrinary4() {
-        // This test case will benefit from an unzipping transformation
-        CodeGen code = new CodeGen("""
-struct Bar { Bar? next; int x; };
-var b = arg ? new Bar { next = (arg==2) ? new Bar{x=2;}; x=1; };
-return b ? b.next ? b.next.x : b.x; // parses "b ? (b.next ? b.next.x : b.x) : 0"
-""");
-        code.parse().opto();
-        assertEquals("return Phi(Region,.x,0);", code.print());
-        assertEquals("0", Eval2.eval(code, 0));
-        assertEquals("1", Eval2.eval(code, 1));
-        assertEquals("2", Eval2.eval(code, 2));
-    }
-
-    @Test
-    public void testTrinary5() {
-        CodeGen code = new CodeGen("""
-flt f=arg?1:1.2;
-return f;   // missing widening
-""");
-        code.parse().opto();
-        assertEquals("return Phi(Region,1.0f,1.2);", code.print());
-        assertEquals("1.2", Eval2.eval(code,  0));
-    }
-
-
-    @Test
-    public void testTrinary6() {
-        CodeGen code = new CodeGen("""
-struct S{};
-return arg ? 7 : new S;
-""");
-        try { code.parse().opto().typeCheck(); fail(); }
-        catch( Exception e ) { assertEquals("No common type amongst int and reference",e.getMessage()); }
-    }
-
-    // ---------------------------------------------------------------
-    @Test
-    public void testFor0() {
-        CodeGen code = new CodeGen("""
-int sum=0;
-for( int i=0; i<arg; i++ )
-    sum += i;
-return sum;
-""");
-        code.parse().opto();
-        assertEquals("return Phi(Loop,0,(Phi_sum+Phi(Loop,0,(Phi_i+1))));", code.print());
-        assertEquals("3", Eval2.eval(code, 3));
-        assertEquals("45", Eval2.eval(code, 10));
-    }
-    @Test
-    public void testFor1() {
-        CodeGen code = new CodeGen("""
-int sum=0, i=0;
-for( ; i<arg; i++ )
-    sum += i;
-return sum;
-""");
-        code.parse().opto();
-        assertEquals("return Phi(Loop,0,(Phi_sum+Phi(Loop,0,(Phi_i+1))));", code.print());
-        assertEquals("3", Eval2.eval(code, 3));
-        assertEquals("45", Eval2.eval(code, 10));
-    }
-    @Test
-    public void testFor2() {
-        CodeGen code = new CodeGen("""
-int sum=0;
-for( int i=0; ; i++ ) {
-    if( i>=arg ) break;
-    sum += i;
-}
-return sum;
-""");
-        code.parse().opto();
-        assertEquals("return Phi(Loop,0,(Phi_sum+Phi(Loop,0,(Phi_i+1))));", code.print());
-        assertEquals("3", Eval2.eval(code, 3));
-        assertEquals("45", Eval2.eval(code, 10));
-    }
-    @Test
-    public void testFor3() {
-        CodeGen code = new CodeGen("""
-int sum=0;
-for( int i=0; i<arg; )
-    sum += i++;
-return sum;
-""");
-        code.parse().opto();
-        assertEquals("return Phi(Loop,0,(Phi_sum+Phi(Loop,0,(Phi_i+1))));", code.print());
-        assertEquals("3", Eval2.eval(code, 3));
-        assertEquals("45", Eval2.eval(code, 10));
-    }
-    @Test
-    public void testFor4() {
-        CodeGen code = new CodeGen("""
-int sum=0;
-for( int i=0; i<arg; i++ )
-    sum += i;
-return i;
-""");
-        try { code.parse().opto(); fail(); }
-        catch( Exception e ) { assertEquals("Undefined name 'i'",e.getMessage()); }
-    }
-    @Test
-    public void testFor5() {
-        CodeGen code = new CodeGen("""
-for(;;arg++;) {}
-""");
-        try { code.parse().opto(); fail(); }
-        catch( Exception e ) { assertEquals("Syntax error, expected Unexpected code after expression: ;",e.getMessage()); }
-    }
-
-
-
-    // ---------------------------------------------------------------
-    @Test
-    public void testForward0() {
-        CodeGen code = new CodeGen("""
-struct A{
-    B? f1;
-    B? f2;
-};
-return new A;
-""");
-        code.parse().opto();
-        assertEquals("return A;", code.print());
-        assertEquals("A{f1=null,f2=null}", Eval2.eval(code,0));
-    }
-
-    @Test
-    public void testForward1() {
-        CodeGen code = new CodeGen("""
-struct A {
-    B?[]? nil_array_of_b;
-    B?[]      array_of_b;
-};
-return new A{array_of_b = new B?[0]; }.array_of_b;
-""");
-        code.parse().opto();
-        assertEquals("return (const)[]*B?;", code.print());
-        assertEquals("*B {... }?[]", Eval2.eval(code,0));
-    }
-
-    // ---------------------------------------------------------------
-    @Test
-    public void testLinkedList2() {
-        CodeGen code = new CodeGen("""
-struct LLI { LLI? next; int i; };
-LLI? !head = null;
-while( arg-- )
-    head = new LLI { next=head; i=arg; };
-int sum=0;
-var ptr = head; // A read-only ptr, to be assigned from read-only next fields
-for( ; ptr; ptr = ptr.next )
-    sum += ptr.i;
-return sum;
-""");
-        code.parse().opto();
-        assertEquals("return Phi(Loop,0,(Phi_sum+.i));", code.print());
-        assertEquals("45", Eval2.eval(code, 10));
-    }
-
-    @Test
-    public void sieveOfEratosthenes() {
-        CodeGen code = new CodeGen(
-"""
-var ary = new bool[arg], primes = new int[arg];
-var nprimes=0, p=0;
-// Find primes while p^2 < arg
-for( p=2; p*p < arg; p++ ) {
-    // skip marked non-primes
-    while( ary[p] ) p++;
-    // p is now a prime
-    primes[nprimes++] = p;
-    // Mark out the rest non-primes
-    for( int i = p + p; i < ary#; i += p )
-        ary[i] = true;
-}
-// Now just collect the remaining primes, no more marking
-for( ; p < arg; p++ )
-    if( !ary[p] )
-        primes[nprimes++] = p;
-// Copy/shrink the result array
-var !rez = new int[nprimes];
-for( int j=0; j<nprimes; j++ )
-    rez[j] = primes[j];
-return rez;
-""");
-        code.parse().opto().typeCheck().GCM();
-        assertEquals("return []i64;", code.print());
-        assertEquals("i64[ 2,3,5,7,11,13,17,19]",Eval2.eval(code, 20));
-    }
-
-}
-- 
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