<!--{
	"Title": "A Quick Guide to Go's Assembler",
	"Path":  "/doc/asm"
}-->

<h2 id="introduction">A Quick Guide to Go's Assembler</h2>

<p>
This document is a quick outline of the unusual form of assembly language used by the <code>gc</code> Go compiler.
The document is not comprehensive.
</p>

<p>
The assembler is based on the input style of the Plan 9 assemblers, which is documented in detail

//go:nowritebarrier
func setMNoWB(mp **m, new *m) {
	(*muintptr)(unsafe.Pointer(mp)).set(new)
}

type gobuf struct {
	// The offsets of sp, pc, and g are known to (hard-coded in) libmach.
	//
	// ctxt is unusual with respect to GC: it may be a
	// heap-allocated funcval, so GC needs to track it, but it
	// needs to be set and cleared from assembly, where it's
	// difficult to have write barriers. However, ctxt is really a

  static int hashCodeImpl(Set<?> s) {
    int hashCode = 0;
    for (Object o : s) {
      hashCode += o != null ? o.hashCode() : 0;

      hashCode = ~~hashCode;
      // Needed to deal with unusual integer overflow in GWT.
    }
    return hashCode;
  }

  /** An implementation for {@link Set#equals(Object)}. */
  static boolean equalsImpl(Set<?> s, @CheckForNull Object object) {

    }

    /* MNG-3944*/
    @Test
    void testInterpolationOfBasedirInPomWithUnusualName() throws Exception {
        PomTestWrapper pom = buildPom("basedir-interpolation/pom-with-unusual-name.xml");
        assertEquals(pom.getBasedir(), new File(pom.getValue("properties/prop0").toString()));
        assertEquals(pom.getBasedir(), new File(pom.getValue("properties/prop1").toString()));
    }

  static int hashCodeImpl(Set<?> s) {
    int hashCode = 0;
    for (Object o : s) {
      hashCode += o != null ? o.hashCode() : 0;

      hashCode = ~~hashCode;
      // Needed to deal with unusual integer overflow in GWT.
    }
    return hashCode;
  }

  /** An implementation for {@link Set#equals(Object)}. */
  static boolean equalsImpl(Set<?> s, @CheckForNull Object object) {

			}`,
			wantErr: `oidc: could not expand distributed claims: jwt returned by distributed claim endpoint "{{.URL}}/groups" did not contain claim: groups`,
		},
		{
			name: "groups-distributed-unusual-name",
			options: Options{
				JWTAuthenticator: apiserver.JWTAuthenticator{
					Issuer: apiserver.Issuer{
						URL:       "{{.URL}}",
						Audiences: []string{"my-client"},
					},

		_, err := os.Stat(c.tempDir)
		nonExistent = os.IsNotExist(err)
		if err != nil && !nonExistent {
			c.Fatalf("TempDir: %v", err)
		}
	}

	if nonExistent {
		c.Helper()

		// Drop unusual characters (such as path separators or
		// characters interacting with globs) from the directory name to
		// avoid surprising os.MkdirTemp behavior.
		mapper := func(r rune) rune {
			if r < utf8.RuneSelf {

  // Instead, use the TEST or TEST_F macro.
  virtual void TestBody() = 0;

  // Sets up, executes, and tears down the test.
  void Run();

  // Deletes self.  We deliberately pick an unusual name for this
  // internal method to avoid clashing with names used in user TESTs.
  void DeleteSelf_() { delete this; }

  // Uses a GTestFlagSaver to save and restore all Google Test flags.

  // Instead, use the TEST or TEST_F macro.
  virtual void TestBody() = 0;

  // Sets up, executes, and tears down the test.
  void Run();

  // Deletes self.  We deliberately pick an unusual name for this
  // internal method to avoid clashing with names used in user TESTs.
  void DeleteSelf_() { delete this; }

  // Uses a GTestFlagSaver to save and restore all Google Test flags.

		// This indicates a user requested -linkmode=external.
		// The startup code uses an import of runtime/cgo to decide
		// whether to initialize the TLS.  So give it one. This could
		// be handled differently but it's an unusual case.
		if lib := loadinternal(ctxt, "runtime/cgo"); lib != nil && lib.Shlib == "" {
			if ctxt.BuildMode == BuildModeShared || ctxt.linkShared {
				Exitf("cannot implicitly include runtime/cgo in a shared library")
			}