Chapter 22: A Hello, World!linear-chapter22

Co-authored-by: godalming123 <68993177+godalming123@users.noreply.github.com>
Co-authored-by: Tamás Hadházy <85063808+Hels15@users.noreply.github.com>

1 files changed, 57 insertions, 40 deletions

diff --git a/src/test/java/com/seaofnodes/simple/TestC.java b/src/test/java/com/seaofnodes/simple/TestC.java
index 5609758b..93fa9b66 100644
--- a/src/test/java/com/seaofnodes/simple/TestC.java
+++ b/src/test/java/com/seaofnodes/simple/TestC.java
@@ -1,10 +1,10 @@
 package com.seaofnodes.simple;
 
 import com.seaofnodes.simple.codegen.CodeGen;
+import java.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
-import java.io.InputStream;
-import java.io.IOException;
+import java.util.concurrent.TimeUnit;
 import static org.junit.Assert.*;
 
 // Call a C driver program, which calls a Simple-generated .o, and self-checks.
@@ -16,8 +16,8 @@ public abstract class TestC {
 
     public static final String CALL_CONVENTION = OS.startsWith("Windows") ? "Win64" : "SystemV";
     public static final String CPU_PORT = switch( CPU ) {
-    case "amd64" -> "x86_64_v2";
-    default -> throw Utils.TODO("Map Yer CPU Port Here");
+        case "amd64" -> "x86_64_v2";
+        default -> throw Utils.TODO("Map Yer CPU Port Here");
     };
 
     public static void run( String file, int spills ) throws IOException { run(file,"",spills); }
@@ -35,48 +35,16 @@ public abstract class TestC {
 
         // Compile and export Simple
         String src = Files.readString(Path.of(sfile));
-        _run(src,CALL_CONVENTION,"",cfile,efile,"S",expected,spills);
+        run(src,CALL_CONVENTION,"",cfile,efile,"S",expected,spills);
     }
 
-    static void _run( String src, String simple_conv, String c_conv, String cfile, String efile, String xtn, String expected, int spills ) throws IOException {
+    public static void run( String src, String simple_conv, String c_conv, String cfile, String efile, String xtn, String expected, int spills ) throws IOException {
         String bin = efile+xtn;
         String obj = bin+".o";
+        String exe = OS.startsWith("Windows") ? bin+".exe" : bin;
         // Compile simple, emit ELF
         CodeGen code = new CodeGen(src).driver( CPU_PORT, simple_conv, obj);
-
-        // Compile the C program
-        var params = new String[] {
-            //if (USE_WSL) "wsl.exe";
-            "gcc",
-            cfile,
-            obj,
-            "-lm", // Picks up 'sqrt' for newtonFloat tests to compare
-            "-g",
-            "-o",
-            bin,
-            "-D",
-            "CALL_CONV="+c_conv,
-        };
-        Process gcc = new ProcessBuilder(params).redirectErrorStream(true).start();
-        byte error;
-        try { error = (byte)gcc.waitFor(); } catch( InterruptedException e ) { throw new IOException("interrupted"); }
-        String result = new String(gcc.getInputStream().readAllBytes());
-        if( error!=0 ) {
-            System.err.println("gcc error code: "+error);
-            System.err.println(result);
-        }
-        assertEquals( 0, error );
-        //assertTrue(result.isEmpty()); // No data in error stream
-
-        // Execute results
-        Process smp = new ProcessBuilder(bin).redirectErrorStream(true).start();
-        try { error = (byte)smp.waitFor(); } catch( InterruptedException e ) { throw new IOException("interrupted"); }
-        result = new String(smp.getInputStream().readAllBytes());
-        if( error!=0 ) {
-            System.err.println("exec error code: "+error);
-            System.err.println(result);
-        }
-        assertEquals( 0, error );
+        String result = gcc(obj, c_conv, cfile, false, exe );
         assertEquals(expected,result);
 
         // Allocation quality not degraded
@@ -84,6 +52,55 @@ public abstract class TestC {
         if( delta==0 ) delta = 1;
         if( spills != -1 )
             assertEquals("Expect spills:",spills,code._regAlloc._spillScaled,delta);
+    }
+
+    public static String gcc( String obj, String c_conv, String cfile, boolean stdin, String... args ) throws IOException {
+
+        // Compile the C program.  Compiling code and constants in the low
+        // 2Gig.  Pointers are 64b BUT since always in the low 2G all the
+        // high bits are zero - and Simple code can be emitted treating
+        // pointers as 4bytes.
+        var params = new Ary<>(String.class);
+        params.add("gcc");
+        if( cfile!=null ) params.add(cfile); // Associated C driver, usually has a `main`
+        params.addAll(new String[] {
+                obj,
+                "-lm", // Picks up 'sqrt' for newtonFloat tests to compare
+                "-g",
+                "-o",
+                args[0],
+        });
+        // Calling convention for C calls, if any
+        if( cfile!=null ) {
+            params.add("-D");
+            params.add("CALL_CONV="+c_conv);
+        }
 
+        // Run GCC to link (optionally compile C driver code)
+        Process gcc = new ProcessBuilder(params.asAry()).redirectErrorStream(true).start();
+        int exit;
+        try {
+            boolean normal = gcc.waitFor(2, TimeUnit.SECONDS);
+            exit = normal ? gcc.exitValue() : -1; // no exit???
+        }  catch( InterruptedException e ) {
+            throw new IOException("interrupted");
+        }
+        String result = new String(gcc.getInputStream().readAllBytes());
+        if( exit!=0 ) {
+            System.err.println("gcc error code: "+exit);
+            System.err.println(result);
+        }
+        assertEquals( 0, exit );
+        //assertTrue(result.isEmpty()); // No data in error stream
+
+        // Execute results
+        ProcessBuilder smp = new ProcessBuilder(args);
+        if( stdin ) smp.redirectInput(ProcessBuilder.Redirect.INHERIT);
+        Process p = smp.start();
+        try { exit = (byte)p.waitFor(); } catch( InterruptedException e ) { throw new IOException("interrupted"); }
+        result = new String(p.getInputStream().readAllBytes());
+        if( exit!=0 )
+            System.err.println("exec exit code: "+exit);
+        return result;
     }
 }