Golang Sizes.Sizeof方法代码示例

func (l langType) rtypeBuild(i int, sizes types.Sizes, t types.Type, name string) (string, reflect.Kind) {
	var kind reflect.Kind
	kind, name = getTypeInfo(t, name)
	sof := int64(4)
	aof := int64(4)
	if kind != reflect.Invalid {
		sof = sizes.Sizeof(t)
		aof = sizes.Alignof(t)
	}

	ret := "Go_haxegoruntime_newRRtype.callFromRT(0,\n"
	ret += fmt.Sprintf("\t/*size:*/ %d,\n", sof)
	ret += fmt.Sprintf("\t/*align:*/ %d,\n", aof)
	ret += fmt.Sprintf("\t/*fieldAlign:*/ %d,\n", aof) // TODO check correct for fieldAlign
	ret += fmt.Sprintf("\t/*kind:*/ %d, // %s\n", kind, (kind & ((1 << 5) - 1)).String())
	alg := "false"
	if types.Comparable(t) {
		alg = "true"
	}
	ret += fmt.Sprintf("\t/*comprable:*/ %s,\n", alg) // TODO change this to be the actual function
	ret += fmt.Sprintf("\t/*string:*/ \"%s\", // %s\n", escapedTypeString(t.String()), t.String())
	ret += fmt.Sprintf("\t/*uncommonType:*/ %s,\n", l.uncommonBuild(i, sizes, name, t))
	ptt := "null"
	for pti, pt := range l.hc.typesByID {
		_, isPtr := pt.(*types.Pointer)
		if isPtr {
			ele := l.hc.pte.At(pt.(*types.Pointer).Elem())
			if ele != nil {
				if i == ele.(int) {
					ptt = fmt.Sprintf("type%d()", pti)
				}
			}
		}
	}
	ret += fmt.Sprintf("\t/*ptrToThis:*/ %s", ptt)
	ret += ")"
	return ret, kind
}

// Interpret interprets the Go program whose main package is mainpkg.
// mode specifies various interpreter options.  filename and args are
// the initial values of os.Args for the target program.  sizes is the
// effective type-sizing function for this program.
//
// Interpret returns the exit code of the program: 2 for panic (like
// gc does), or the argument to os.Exit for normal termination.
//
// The SSA program must include the "runtime" package.
//
func Interpret(mainpkg *ssa.Package, mode Mode, sizes types.Sizes, filename string, args []string) (exitCode int) {
	i := &interpreter{
		prog:    mainpkg.Prog,
		globals: make(map[ssa.Value]*value),
		mode:    mode,
		sizes:   sizes,
	}
	runtimePkg := i.prog.ImportedPackage("runtime")
	if runtimePkg == nil {
		panic("ssa.Program doesn't include runtime package")
	}
	i.runtimeErrorString = runtimePkg.Type("errorString").Object().Type()

	initReflect(i)

	i.osArgs = append(i.osArgs, filename)
	for _, arg := range args {
		i.osArgs = append(i.osArgs, arg)
	}

	for _, pkg := range i.prog.AllPackages() {
		// Initialize global storage.
		for _, m := range pkg.Members {
			switch v := m.(type) {
			case *ssa.Global:
				cell := zero(deref(v.Type()))
				i.globals[v] = &cell
			}
		}

		// Ad-hoc initialization for magic system variables.
		switch pkg.Object.Path() {
		case "syscall":
			setGlobal(i, pkg, "envs", environ)

		case "runtime":
			sz := sizes.Sizeof(pkg.Object.Scope().Lookup("MemStats").Type())
			setGlobal(i, pkg, "sizeof_C_MStats", uintptr(sz))

			// Delete the bodies of almost all "runtime" functions since they're magic.
			// A missing intrinsic leads to a very clear error.
			for _, mem := range pkg.Members {
				if fn, ok := mem.(*ssa.Function); ok {
					switch fn.Name() {
					case "GOROOT", "gogetenv":
						// keep
					default:
						fn.Blocks = nil
					}
				}
			}
		}
	}

	// Top-level error handler.
	exitCode = 2
	defer func() {
		if exitCode != 2 || i.mode&DisableRecover != 0 {
			return
		}
		switch p := recover().(type) {
		case exitPanic:
			exitCode = int(p)
			return
		case targetPanic:
			fmt.Fprintln(os.Stderr, "panic:", toString(p.v))
		case runtime.Error:
			fmt.Fprintln(os.Stderr, "panic:", p.Error())
		case string:
			fmt.Fprintln(os.Stderr, "panic:", p)
		default:
			fmt.Fprintf(os.Stderr, "panic: unexpected type: %T\n", p)
		}

		// TODO(adonovan): dump panicking interpreter goroutine?
		// buf := make([]byte, 0x10000)
		// runtime.Stack(buf, false)
		// fmt.Fprintln(os.Stderr, string(buf))
		// (Or dump panicking target goroutine?)
	}()

	// Run!
	call(i, nil, token.NoPos, mainpkg.Func("init"), nil)
	if mainFn := mainpkg.Func("main"); mainFn != nil {
		call(i, nil, token.NoPos, mainFn, nil)
		exitCode = 0
	} else {
		fmt.Fprintln(os.Stderr, "No main function.")
		exitCode = 1
	}
//.........这里部分代码省略.........