1 files changed, 89 insertions, 0 deletions
diff --git a/chapter-sccp/src/test/java/com/seaofnodes/simple/BrainFuckTest.java b/chapter-sccp/src/test/java/com/seaofnodes/simple/BrainFuckTest.java
new file mode 100644
index 00000000..a3b98fe0
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+++ b/chapter-sccp/src/test/java/com/seaofnodes/simple/BrainFuckTest.java
@@ -0,0 +1,89 @@
+package com.seaofnodes.simple;
+
+import com.seaofnodes.isa.eval.EvalRisc5;
+
+import com.seaofnodes.isa.eval.EvalArm64;
+
+import com.seaofnodes.simple.codegen.CodeGen;
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import org.junit.Test;
+import static org.junit.Assert.assertEquals;
+import static org.junit.Assert.fail;
+
+public class BrainFuckTest {
+
+    @Test public void testBrainFuck() throws IOException {
+        String brain_fuck = "Hello World!\n";
+        String src =
+"""
+// -*- mode: java;  -*-
+val brain_fuck = { ->
+    var !program = "++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.";
+    int d = 0;
+    u8[] !output = new u8[0];
+    u8[] !data = new u8[100];
+
+    for( int pc = 0; pc < program#; pc++ ) {
+        var command = program[pc];
+        if (command == 62) {
+            d++;
+        } else if (command == 60) {
+            d--;
+        } else if (command == 43) {
+            data[d]++;
+        } else if (command == 45) {
+            data[d]--;
+        } else if (command == 46) {
+            // Output a byte; increase the output array size
+            var old = output;
+            output = new u8[output# + 1];
+            for( int i = 0; i < old#; i++ )
+                output[i] = old[i];
+            output[old#] = data[d]; // Add the extra byte on the end
+        } else if (command == 44) {
+            data[d] = 42;
+        } else if (command == 91) {
+            if (data[d] == 0) {
+                for( int d = 1; d > 0; ) {
+                    command = program[++pc];
+                    if (command == 91) d++;
+                    if (command == 93) d--;
+                }
+            }
+        } else if (command == 93) {
+            if (data[d]) {
+                for( int d = 1; d > 0; ) {
+                    command = program[--pc];
+                    if (command == 93) d++;
+                    if (command == 91) d--;
+                }
+            }
+        }
+    }
+    return output;
+};
+""";
+        TestC.run(src,"brain_fuck", null, brain_fuck, 40);
+
+        EvalRisc5 R5 = TestRisc5.build("brain_fuck", src, 0, 28, false);
+        int trap = R5.step(100000);
+        assertEquals(0,trap);
+        int ptr = (int)R5.regs[com.seaofnodes.simple.node.cpus.riscv.riscv.A0];
+        assertEquals(brain_fuck.length(),R5.ld4s(ptr));
+        for( int i=0; i<brain_fuck.length(); i++ )
+            assertEquals(brain_fuck.charAt(i), R5.ld1z(ptr+4+i));
+
+        EvalArm64 A5 = TestArm64.build("brain_fuck", src, 0, 28, false);
+        int trap_arm = A5.step(100000);
+        assertEquals(0,trap_arm);
+        assertEquals(0,trap);
+        int ptr_arm = (int)A5.regs[com.seaofnodes.simple.node.cpus.arm.arm.X0];
+        assertEquals(brain_fuck.length(),A5.ld4s(ptr_arm));
+
+        for( int i=0; i<brain_fuck.length(); i++ )
+            assertEquals(brain_fuck.charAt(i), A5.ld1z(ptr_arm+4+i));
+    }
+
+}