Class TestC

chapter22/src/test/java/com/seaofnodes/simple/TestC.java:12–106

// Call a C driver program, which calls a Simple-generated .o, and self-checks.
// Expects GCC from the default CLI, compiles C, compiles Simple, links and runs.
public abstract class TestC {

    public static final String OS  = System.getProperty("os.name");
    public static final String CPU = System.getProperty("os.arch");

    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");
    };

    public static void run( String file, int spills ) throws IOException { run(file,"",spills); }

    public static void run( String file, String expected, int spills ) throws IOException {
        run("src/test/java/com/seaofnodes/simple/progs",file,expected,spills);
    }

    // Compile and run a simple program
    public static void run( String dir, String file, String expected, int spills ) throws IOException {
        // Files
        String  cfile = dir+"/"+file+".c"  ;
        String  sfile = dir+"/"+file+".smp";
        String  efile = "build/objs/"+file;

        // Compile and export Simple
        String src = Files.readString(Path.of(sfile));
        run(src,CALL_CONVENTION,"",cfile,efile,"S",expected,spills);
    }

    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);
        String result = gcc(obj, c_conv, cfile, false, exe );
        assertEquals(expected,result);

        // Allocation quality not degraded
        int delta = spills>>3;
        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",