Example #1
0
func (dbp *Process) resolveNameOff(typeAddr uintptr, off uintptr) (uintptr, error) {
	// See runtime.resolveNameOff in $GOROOT/src/runtime/type.go
	if err := dbp.loadModuleData(); err != nil {
		return 0, err
	}
	for _, md := range dbp.moduleData {
		if typeAddr >= md.types && typeAddr < md.etypes {
			return md.types + off, nil
		}
	}

	scope := &EvalScope{Thread: dbp.CurrentThread, PC: 0, CFA: 0}
	reflectOffs, err := scope.packageVarAddr("runtime.reflectOffs")
	if err != nil {
		return 0, err
	}

	reflectOffsm, err := reflectOffs.structMember("m")
	if err != nil {
		return 0, err
	}

	v, err := reflectOffsm.mapAccess(newConstant(constant.MakeUint64(uint64(off)), dbp.CurrentThread))
	if err != nil {
		return 0, err
	}

	resv := v.maybeDereference()
	if resv.Unreadable != nil {
		return 0, resv.Unreadable
	}

	return resv.Addr, nil
}
Example #2
0
func (s *scanner) scanParam(lval *sqlSymType) {
	start := s.pos
	for isDigit(s.peek()) {
		s.pos++
	}
	lval.str = s.in[start:s.pos]

	uval, err := strconv.ParseUint(lval.str, 10, 64)
	if err == nil && uval > 1<<63 {
		err = fmt.Errorf("integer value out of range: %d", uval)
	}
	if err != nil {
		lval.id = ERROR
		lval.str = err.Error()
		return
	}

	// uval is now in the range [0, 1<<63]. Casting to an int64 leaves the range
	// [0, 1<<63 - 1] intact and moves 1<<63 to -1<<63 (a.k.a. math.MinInt64).
	lval.union.val = &NumVal{Value: constant.MakeUint64(uval)}
	lval.id = PARAM
}
Example #3
0
func (v *Variable) loadValueInternal(recurseLevel int, cfg LoadConfig) {
	if v.Unreadable != nil || v.loaded || (v.Addr == 0 && v.Base == 0) {
		return
	}

	v.loaded = true
	switch v.Kind {
	case reflect.Ptr, reflect.UnsafePointer:
		v.Len = 1
		v.Children = []Variable{*v.maybeDereference()}
		if cfg.FollowPointers {
			// Don't increase the recursion level when dereferencing pointers
			v.Children[0].loadValueInternal(recurseLevel, cfg)
		} else {
			v.Children[0].OnlyAddr = true
		}

	case reflect.Chan:
		sv := v.clone()
		sv.RealType = resolveTypedef(&(sv.RealType.(*dwarf.ChanType).TypedefType))
		sv = sv.maybeDereference()
		sv.loadValueInternal(0, loadFullValue)
		v.Children = sv.Children
		v.Len = sv.Len
		v.Base = sv.Addr

	case reflect.Map:
		if recurseLevel <= cfg.MaxVariableRecurse {
			v.loadMap(recurseLevel, cfg)
		}

	case reflect.String:
		var val string
		val, v.Unreadable = readStringValue(v.mem, v.Base, v.Len, cfg)
		v.Value = constant.MakeString(val)

	case reflect.Slice, reflect.Array:
		v.loadArrayValues(recurseLevel, cfg)

	case reflect.Struct:
		v.mem = cacheMemory(v.mem, v.Addr, int(v.RealType.Size()))
		t := v.RealType.(*dwarf.StructType)
		v.Len = int64(len(t.Field))
		// Recursively call extractValue to grab
		// the value of all the members of the struct.
		if recurseLevel <= cfg.MaxVariableRecurse {
			v.Children = make([]Variable, 0, len(t.Field))
			for i, field := range t.Field {
				if cfg.MaxStructFields >= 0 && len(v.Children) >= cfg.MaxStructFields {
					break
				}
				f, _ := v.toField(field)
				v.Children = append(v.Children, *f)
				v.Children[i].Name = field.Name
				v.Children[i].loadValueInternal(recurseLevel+1, cfg)
			}
		}

	case reflect.Interface:
		v.loadInterface(recurseLevel, true, cfg)

	case reflect.Complex64, reflect.Complex128:
		v.readComplex(v.RealType.(*dwarf.ComplexType).ByteSize)
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		var val int64
		val, v.Unreadable = readIntRaw(v.mem, v.Addr, v.RealType.(*dwarf.IntType).ByteSize)
		v.Value = constant.MakeInt64(val)
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		var val uint64
		val, v.Unreadable = readUintRaw(v.mem, v.Addr, v.RealType.(*dwarf.UintType).ByteSize)
		v.Value = constant.MakeUint64(val)

	case reflect.Bool:
		val, err := v.mem.readMemory(v.Addr, 1)
		v.Unreadable = err
		if err == nil {
			v.Value = constant.MakeBool(val[0] != 0)
		}
	case reflect.Float32, reflect.Float64:
		var val float64
		val, v.Unreadable = v.readFloatRaw(v.RealType.(*dwarf.FloatType).ByteSize)
		v.Value = constant.MakeFloat64(val)
	case reflect.Func:
		v.readFunctionPtr()
	default:
		v.Unreadable = fmt.Errorf("unknown or unsupported kind: \"%s\"", v.Kind.String())
	}
}
Example #4
0
File: eval.go Project: mattn/delve
// Eval type cast expressions
func (scope *EvalScope) evalTypeCast(node *ast.CallExpr) (*Variable, error) {
	argv, err := scope.evalAST(node.Args[0])
	if err != nil {
		return nil, err
	}
	argv.loadValue()
	if argv.Unreadable != nil {
		return nil, argv.Unreadable
	}

	fnnode := node.Fun

	// remove all enclosing parenthesis from the type name
	for {
		p, ok := fnnode.(*ast.ParenExpr)
		if !ok {
			break
		}
		fnnode = p.X
	}

	styp, err := scope.Thread.dbp.findTypeExpr(fnnode)
	if err != nil {
		return nil, err
	}
	typ := resolveTypedef(styp)

	converr := fmt.Errorf("can not convert %q to %s", exprToString(node.Args[0]), typ.String())

	v := newVariable("", 0, styp, scope.Thread.dbp, scope.Thread)
	v.loaded = true

	switch ttyp := typ.(type) {
	case *dwarf.PtrType:
		switch argv.Kind {
		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
			// ok
		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
			// ok
		default:
			return nil, converr
		}

		n, _ := constant.Int64Val(argv.Value)

		v.Children = []Variable{*(scope.newVariable("", uintptr(n), ttyp.Type))}
		return v, nil

	case *dwarf.UintType:
		switch argv.Kind {
		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
			n, _ := constant.Int64Val(argv.Value)
			v.Value = constant.MakeUint64(convertInt(uint64(n), false, ttyp.Size()))
			return v, nil
		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
			n, _ := constant.Uint64Val(argv.Value)
			v.Value = constant.MakeUint64(convertInt(n, false, ttyp.Size()))
			return v, nil
		case reflect.Float32, reflect.Float64:
			x, _ := constant.Float64Val(argv.Value)
			v.Value = constant.MakeUint64(uint64(x))
			return v, nil
		}
	case *dwarf.IntType:
		switch argv.Kind {
		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
			n, _ := constant.Int64Val(argv.Value)
			v.Value = constant.MakeInt64(int64(convertInt(uint64(n), true, ttyp.Size())))
			return v, nil
		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
			n, _ := constant.Uint64Val(argv.Value)
			v.Value = constant.MakeInt64(int64(convertInt(n, true, ttyp.Size())))
			return v, nil
		case reflect.Float32, reflect.Float64:
			x, _ := constant.Float64Val(argv.Value)
			v.Value = constant.MakeInt64(int64(x))
			return v, nil
		}
	case *dwarf.FloatType:
		switch argv.Kind {
		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
			fallthrough
		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
			fallthrough
		case reflect.Float32, reflect.Float64:
			v.Value = argv.Value
			return v, nil
		}
	case *dwarf.ComplexType:
		switch argv.Kind {
		case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
			fallthrough
		case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
			fallthrough
		case reflect.Float32, reflect.Float64:
			v.Value = argv.Value
			return v, nil
		}
	}

	return nil, converr
}
Example #5
0
func (v *Variable) loadValueInternal(recurseLevel int) {
	if v.Unreadable != nil || v.loaded || (v.Addr == 0 && v.base == 0) {
		return
	}
	v.loaded = true
	switch v.Kind {
	case reflect.Ptr, reflect.UnsafePointer:
		v.Len = 1
		v.Children = []Variable{*v.maybeDereference()}
		// Don't increase the recursion level when dereferencing pointers
		v.Children[0].loadValueInternal(recurseLevel)

	case reflect.Chan:
		sv := v.maybeDereference()
		sv.loadValueInternal(recurseLevel)
		v.Children = sv.Children
		v.Len = sv.Len
		v.base = sv.Addr

	case reflect.Map:
		v.loadMap(recurseLevel)

	case reflect.String:
		var val string
		val, v.Unreadable = v.thread.readStringValue(v.base, v.Len)
		v.Value = constant.MakeString(val)

	case reflect.Slice, reflect.Array:
		v.loadArrayValues(recurseLevel)

	case reflect.Struct:
		t := v.RealType.(*dwarf.StructType)
		v.Len = int64(len(t.Field))
		// Recursively call extractValue to grab
		// the value of all the members of the struct.
		if recurseLevel <= maxVariableRecurse {
			v.Children = make([]Variable, 0, len(t.Field))
			for i, field := range t.Field {
				f, _ := v.toField(field)
				v.Children = append(v.Children, *f)
				v.Children[i].Name = field.Name
				v.Children[i].loadValueInternal(recurseLevel + 1)
			}
		}

	case reflect.Complex64, reflect.Complex128:
		v.readComplex(v.RealType.(*dwarf.ComplexType).ByteSize)
	case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
		var val int64
		val, v.Unreadable = v.thread.readIntRaw(v.Addr, v.RealType.(*dwarf.IntType).ByteSize)
		v.Value = constant.MakeInt64(val)
	case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
		var val uint64
		val, v.Unreadable = v.thread.readUintRaw(v.Addr, v.RealType.(*dwarf.UintType).ByteSize)
		v.Value = constant.MakeUint64(val)

	case reflect.Bool:
		val, err := v.thread.readMemory(v.Addr, 1)
		v.Unreadable = err
		if err == nil {
			v.Value = constant.MakeBool(val[0] != 0)
		}
	case reflect.Float32, reflect.Float64:
		var val float64
		val, v.Unreadable = v.readFloatRaw(v.RealType.(*dwarf.FloatType).ByteSize)
		v.Value = constant.MakeFloat64(val)
	case reflect.Func:
		v.readFunctionPtr()
	default:
		v.Unreadable = fmt.Errorf("unknown or unsupported kind: \"%s\"", v.Kind.String())
	}
}