| /*! |
| |
| Runtime type reflection |
| |
| */ |
| |
| #[forbid(deprecated_mode)]; |
| #[forbid(deprecated_pattern)]; |
| |
| use intrinsic::{TyDesc, get_tydesc, visit_tydesc, TyVisitor}; |
| use libc::c_void; |
| |
| /** |
| * Trait for visitor that wishes to reflect on data. To use this, create a |
| * struct that encapsulates the set of pointers you wish to walk through a |
| * data structure, and implement both `MovePtr` for it as well as `TyVisitor`; |
| * then build a MovePtrAdaptor wrapped around your struct. |
| */ |
| pub trait MovePtr { |
| fn move_ptr(adjustment: fn(*c_void) -> *c_void); |
| } |
| |
| /// Helper function for alignment calculation. |
| #[inline(always)] |
| fn align(size: uint, align: uint) -> uint { |
| ((size + align) - 1u) & !(align - 1u) |
| } |
| |
| /// Adaptor to wrap around visitors implementing MovePtr. |
| struct MovePtrAdaptor<V: TyVisitor MovePtr> { |
| inner: V |
| } |
| pub fn MovePtrAdaptor<V: TyVisitor MovePtr>(v: V) -> MovePtrAdaptor<V> { |
| MovePtrAdaptor { inner: move v } |
| } |
| |
| /// Abstract type-directed pointer-movement using the MovePtr trait |
| impl<V: TyVisitor MovePtr> MovePtrAdaptor<V>: TyVisitor { |
| |
| #[inline(always)] |
| fn bump(sz: uint) { |
| do self.inner.move_ptr() |p| { |
| ((p as uint) + sz) as *c_void |
| }; |
| } |
| |
| #[inline(always)] |
| fn align(a: uint) { |
| do self.inner.move_ptr() |p| { |
| align(p as uint, a) as *c_void |
| }; |
| } |
| |
| #[inline(always)] |
| fn align_to<T>() { |
| self.align(sys::min_align_of::<T>()); |
| } |
| |
| #[inline(always)] |
| fn bump_past<T>() { |
| self.bump(sys::size_of::<T>()); |
| } |
| |
| fn visit_bot() -> bool { |
| self.align_to::<()>(); |
| if ! self.inner.visit_bot() { return false; } |
| self.bump_past::<()>(); |
| true |
| } |
| |
| fn visit_nil() -> bool { |
| self.align_to::<()>(); |
| if ! self.inner.visit_nil() { return false; } |
| self.bump_past::<()>(); |
| true |
| } |
| |
| fn visit_bool() -> bool { |
| self.align_to::<bool>(); |
| if ! self.inner.visit_bool() { return false; } |
| self.bump_past::<bool>(); |
| true |
| } |
| |
| fn visit_int() -> bool { |
| self.align_to::<int>(); |
| if ! self.inner.visit_int() { return false; } |
| self.bump_past::<int>(); |
| true |
| } |
| |
| fn visit_i8() -> bool { |
| self.align_to::<i8>(); |
| if ! self.inner.visit_i8() { return false; } |
| self.bump_past::<i8>(); |
| true |
| } |
| |
| fn visit_i16() -> bool { |
| self.align_to::<i16>(); |
| if ! self.inner.visit_i16() { return false; } |
| self.bump_past::<i16>(); |
| true |
| } |
| |
| fn visit_i32() -> bool { |
| self.align_to::<i32>(); |
| if ! self.inner.visit_i32() { return false; } |
| self.bump_past::<i32>(); |
| true |
| } |
| |
| fn visit_i64() -> bool { |
| self.align_to::<i64>(); |
| if ! self.inner.visit_i64() { return false; } |
| self.bump_past::<i64>(); |
| true |
| } |
| |
| fn visit_uint() -> bool { |
| self.align_to::<uint>(); |
| if ! self.inner.visit_uint() { return false; } |
| self.bump_past::<uint>(); |
| true |
| } |
| |
| fn visit_u8() -> bool { |
| self.align_to::<u8>(); |
| if ! self.inner.visit_u8() { return false; } |
| self.bump_past::<u8>(); |
| true |
| } |
| |
| fn visit_u16() -> bool { |
| self.align_to::<u16>(); |
| if ! self.inner.visit_u16() { return false; } |
| self.bump_past::<u16>(); |
| true |
| } |
| |
| fn visit_u32() -> bool { |
| self.align_to::<u32>(); |
| if ! self.inner.visit_u32() { return false; } |
| self.bump_past::<u32>(); |
| true |
| } |
| |
| fn visit_u64() -> bool { |
| self.align_to::<u64>(); |
| if ! self.inner.visit_u64() { return false; } |
| self.bump_past::<u64>(); |
| true |
| } |
| |
| fn visit_float() -> bool { |
| self.align_to::<float>(); |
| if ! self.inner.visit_float() { return false; } |
| self.bump_past::<float>(); |
| true |
| } |
| |
| fn visit_f32() -> bool { |
| self.align_to::<f32>(); |
| if ! self.inner.visit_f32() { return false; } |
| self.bump_past::<f32>(); |
| true |
| } |
| |
| fn visit_f64() -> bool { |
| self.align_to::<f64>(); |
| if ! self.inner.visit_f64() { return false; } |
| self.bump_past::<f64>(); |
| true |
| } |
| |
| fn visit_char() -> bool { |
| self.align_to::<char>(); |
| if ! self.inner.visit_char() { return false; } |
| self.bump_past::<char>(); |
| true |
| } |
| |
| fn visit_str() -> bool { |
| self.align_to::<~str>(); |
| if ! self.inner.visit_str() { return false; } |
| self.bump_past::<~str>(); |
| true |
| } |
| |
| fn visit_estr_box() -> bool { |
| self.align_to::<@str>(); |
| if ! self.inner.visit_estr_box() { return false; } |
| self.bump_past::<@str>(); |
| true |
| } |
| |
| fn visit_estr_uniq() -> bool { |
| self.align_to::<~str>(); |
| if ! self.inner.visit_estr_uniq() { return false; } |
| self.bump_past::<~str>(); |
| true |
| } |
| |
| fn visit_estr_slice() -> bool { |
| self.align_to::<&static/str>(); |
| if ! self.inner.visit_estr_slice() { return false; } |
| self.bump_past::<&static/str>(); |
| true |
| } |
| |
| fn visit_estr_fixed(n: uint, |
| sz: uint, |
| align: uint) -> bool { |
| self.align(align); |
| if ! self.inner.visit_estr_fixed(n, sz, align) { return false; } |
| self.bump(sz); |
| true |
| } |
| |
| fn visit_box(mtbl: uint, inner: *TyDesc) -> bool { |
| self.align_to::<@u8>(); |
| if ! self.inner.visit_box(mtbl, inner) { return false; } |
| self.bump_past::<@u8>(); |
| true |
| } |
| |
| fn visit_uniq(mtbl: uint, inner: *TyDesc) -> bool { |
| self.align_to::<~u8>(); |
| if ! self.inner.visit_uniq(mtbl, inner) { return false; } |
| self.bump_past::<~u8>(); |
| true |
| } |
| |
| fn visit_ptr(mtbl: uint, inner: *TyDesc) -> bool { |
| self.align_to::<*u8>(); |
| if ! self.inner.visit_ptr(mtbl, inner) { return false; } |
| self.bump_past::<*u8>(); |
| true |
| } |
| |
| fn visit_rptr(mtbl: uint, inner: *TyDesc) -> bool { |
| self.align_to::<&static/u8>(); |
| if ! self.inner.visit_rptr(mtbl, inner) { return false; } |
| self.bump_past::<&static/u8>(); |
| true |
| } |
| |
| fn visit_unboxed_vec(mtbl: uint, inner: *TyDesc) -> bool { |
| self.align_to::<vec::UnboxedVecRepr>(); |
| if ! self.inner.visit_vec(mtbl, inner) { return false; } |
| true |
| } |
| |
| fn visit_vec(mtbl: uint, inner: *TyDesc) -> bool { |
| self.align_to::<~[u8]>(); |
| if ! self.inner.visit_vec(mtbl, inner) { return false; } |
| self.bump_past::<~[u8]>(); |
| true |
| } |
| |
| fn visit_evec_box(mtbl: uint, inner: *TyDesc) -> bool { |
| self.align_to::<@[u8]>(); |
| if ! self.inner.visit_evec_box(mtbl, inner) { return false; } |
| self.bump_past::<@[u8]>(); |
| true |
| } |
| |
| fn visit_evec_uniq(mtbl: uint, inner: *TyDesc) -> bool { |
| self.align_to::<~[u8]>(); |
| if ! self.inner.visit_evec_uniq(mtbl, inner) { return false; } |
| self.bump_past::<~[u8]>(); |
| true |
| } |
| |
| fn visit_evec_slice(mtbl: uint, inner: *TyDesc) -> bool { |
| self.align_to::<&static/[u8]>(); |
| if ! self.inner.visit_evec_slice(mtbl, inner) { return false; } |
| self.bump_past::<&static/[u8]>(); |
| true |
| } |
| |
| fn visit_evec_fixed(n: uint, sz: uint, align: uint, |
| mtbl: uint, inner: *TyDesc) -> bool { |
| self.align(align); |
| if ! self.inner.visit_evec_fixed(n, sz, align, mtbl, inner) { |
| return false; |
| } |
| self.bump(sz); |
| true |
| } |
| |
| fn visit_enter_rec(n_fields: uint, sz: uint, align: uint) -> bool { |
| self.align(align); |
| if ! self.inner.visit_enter_rec(n_fields, sz, align) { return false; } |
| true |
| } |
| |
| fn visit_rec_field(i: uint, name: &str, |
| mtbl: uint, inner: *TyDesc) -> bool { |
| unsafe { self.align((*inner).align); } |
| if ! self.inner.visit_rec_field(i, name, mtbl, inner) { |
| return false; |
| } |
| unsafe { self.bump((*inner).size); } |
| true |
| } |
| |
| fn visit_leave_rec(n_fields: uint, sz: uint, align: uint) -> bool { |
| if ! self.inner.visit_leave_rec(n_fields, sz, align) { return false; } |
| true |
| } |
| |
| fn visit_enter_class(n_fields: uint, sz: uint, align: uint) -> bool { |
| self.align(align); |
| if ! self.inner.visit_enter_class(n_fields, sz, align) { |
| return false; |
| } |
| true |
| } |
| |
| fn visit_class_field(i: uint, name: &str, |
| mtbl: uint, inner: *TyDesc) -> bool { |
| unsafe { self.align((*inner).align); } |
| if ! self.inner.visit_class_field(i, name, mtbl, inner) { |
| return false; |
| } |
| unsafe { self.bump((*inner).size); } |
| true |
| } |
| |
| fn visit_leave_class(n_fields: uint, sz: uint, align: uint) -> bool { |
| if ! self.inner.visit_leave_class(n_fields, sz, align) { |
| return false; |
| } |
| true |
| } |
| |
| fn visit_enter_tup(n_fields: uint, sz: uint, align: uint) -> bool { |
| self.align(align); |
| if ! self.inner.visit_enter_tup(n_fields, sz, align) { return false; } |
| true |
| } |
| |
| fn visit_tup_field(i: uint, inner: *TyDesc) -> bool { |
| unsafe { self.align((*inner).align); } |
| if ! self.inner.visit_tup_field(i, inner) { return false; } |
| unsafe { self.bump((*inner).size); } |
| true |
| } |
| |
| fn visit_leave_tup(n_fields: uint, sz: uint, align: uint) -> bool { |
| if ! self.inner.visit_leave_tup(n_fields, sz, align) { return false; } |
| true |
| } |
| |
| fn visit_enter_fn(purity: uint, proto: uint, |
| n_inputs: uint, retstyle: uint) -> bool { |
| if ! self.inner.visit_enter_fn(purity, proto, n_inputs, retstyle) { |
| return false |
| } |
| true |
| } |
| |
| fn visit_fn_input(i: uint, mode: uint, inner: *TyDesc) -> bool { |
| if ! self.inner.visit_fn_input(i, mode, inner) { return false; } |
| true |
| } |
| |
| fn visit_fn_output(retstyle: uint, inner: *TyDesc) -> bool { |
| if ! self.inner.visit_fn_output(retstyle, inner) { return false; } |
| true |
| } |
| |
| fn visit_leave_fn(purity: uint, proto: uint, |
| n_inputs: uint, retstyle: uint) -> bool { |
| if ! self.inner.visit_leave_fn(purity, proto, n_inputs, retstyle) { |
| return false; |
| } |
| true |
| } |
| |
| fn visit_enter_enum(n_variants: uint, sz: uint, align: uint) -> bool { |
| self.align(align); |
| if ! self.inner.visit_enter_enum(n_variants, sz, align) { |
| return false; |
| } |
| true |
| } |
| |
| fn visit_enter_enum_variant(variant: uint, |
| disr_val: int, |
| n_fields: uint, |
| name: &str) -> bool { |
| if ! self.inner.visit_enter_enum_variant(variant, disr_val, |
| n_fields, name) { |
| return false; |
| } |
| true |
| } |
| |
| fn visit_enum_variant_field(i: uint, inner: *TyDesc) -> bool { |
| if ! self.inner.visit_enum_variant_field(i, inner) { return false; } |
| true |
| } |
| |
| fn visit_leave_enum_variant(variant: uint, |
| disr_val: int, |
| n_fields: uint, |
| name: &str) -> bool { |
| if ! self.inner.visit_leave_enum_variant(variant, disr_val, |
| n_fields, name) { |
| return false; |
| } |
| true |
| } |
| |
| fn visit_leave_enum(n_variants: uint, sz: uint, align: uint) -> bool { |
| if ! self.inner.visit_leave_enum(n_variants, sz, align) { |
| return false; |
| } |
| true |
| } |
| |
| fn visit_trait() -> bool { |
| self.align_to::<TyVisitor>(); |
| if ! self.inner.visit_trait() { return false; } |
| self.bump_past::<TyVisitor>(); |
| true |
| } |
| |
| fn visit_var() -> bool { |
| if ! self.inner.visit_var() { return false; } |
| true |
| } |
| |
| fn visit_var_integral() -> bool { |
| if ! self.inner.visit_var_integral() { return false; } |
| true |
| } |
| |
| fn visit_param(i: uint) -> bool { |
| if ! self.inner.visit_param(i) { return false; } |
| true |
| } |
| |
| fn visit_self() -> bool { |
| self.align_to::<&static/u8>(); |
| if ! self.inner.visit_self() { return false; } |
| self.align_to::<&static/u8>(); |
| true |
| } |
| |
| fn visit_type() -> bool { |
| if ! self.inner.visit_type() { return false; } |
| true |
| } |
| |
| fn visit_opaque_box() -> bool { |
| self.align_to::<@u8>(); |
| if ! self.inner.visit_opaque_box() { return false; } |
| self.bump_past::<@u8>(); |
| true |
| } |
| |
| fn visit_constr(inner: *TyDesc) -> bool { |
| if ! self.inner.visit_constr(inner) { return false; } |
| true |
| } |
| |
| fn visit_closure_ptr(ck: uint) -> bool { |
| self.align_to::<fn@()>(); |
| if ! self.inner.visit_closure_ptr(ck) { return false; } |
| self.bump_past::<fn@()>(); |
| true |
| } |
| } |
