Ejemplo n.º 1
0
func (tm *LLVMTypeMap) Sizeof(typ types.Type) int64 {
	switch typ := typ.Underlying().(type) {
	case *types.Basic:
		switch typ.Kind() {
		case types.Int, types.Uint:
			return int64(tm.target.TypeAllocSize(tm.inttype))
		case types.Uintptr, types.UnsafePointer:
			return int64(tm.target.PointerSize())
		case types.String:
			return 2 * int64(tm.target.PointerSize())
		}
		return types.DefaultSizeof(typ)
	case *types.Array:
		eltsize := tm.Sizeof(typ.Elem())
		eltalign := tm.Alignof(typ.Elem())
		var eltpad int64
		if eltsize%eltalign != 0 {
			eltpad = eltalign - (eltsize % eltalign)
		}
		return (eltsize + eltpad) * typ.Len()
	case *types.Struct:
		if typ.NumFields() == 0 {
			return 0
		}
		fields := make([]*types.Field, int(typ.NumFields()))
		for i := range fields {
			fields[i] = typ.Field(i)
		}
		offsets := tm.Offsetsof(fields)
		n := len(fields)
		return offsets[n-1] + tm.Sizeof(fields[n-1].Type)
	}
	return int64(tm.target.PointerSize())
}
Ejemplo n.º 2
0
func ext۰reflect۰rtype۰Size(fn *ssa.Function, args []value) value {
	// Signature: func (t reflect.rtype) uintptr
	// (Assumes no custom Sizeof used during SSA construction.)
	return uintptr(types.DefaultSizeof(args[0].(rtype).t))
}
Ejemplo n.º 3
0
// 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.
//
// Interpret returns the exit code of the program: 2 for panic (like
// gc does), or the argument to os.Exit for normal termination.
//
func Interpret(mainpkg *ssa.Package, mode Mode, filename string, args []string) (exitCode int) {
	i := &interpreter{
		prog:    mainpkg.Prog,
		globals: make(map[ssa.Value]*value),
		mode:    mode,
	}
	initReflect(i)

	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":
			var envs []value
			for _, s := range os.Environ() {
				envs = append(envs, s)
			}
			envs = append(envs, "GOSSAINTERP=1")
			envs = append(envs, "GOARCH="+runtime.GOARCH)
			setGlobal(i, pkg, "envs", envs)

		case "runtime":
			// (Assumes no custom Sizeof used during SSA construction.)
			sz := types.DefaultSizeof(pkg.Object.Scope().Lookup("MemStats").Type())
			setGlobal(i, pkg, "sizeof_C_MStats", uintptr(sz))

		case "os":
			Args := []value{filename}
			for _, s := range args {
				Args = append(Args, s)
			}
			setGlobal(i, pkg, "Args", Args)
		}
	}

	// 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
	}
	return
}