488 lines
13 KiB
Rust
488 lines
13 KiB
Rust
// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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/*!
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Runtime type reflection
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*/
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#[forbid(deprecated_mode)];
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#[forbid(deprecated_pattern)];
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use intrinsic::{TyDesc, get_tydesc, visit_tydesc, TyVisitor};
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use libc::c_void;
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/**
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* Trait for visitor that wishes to reflect on data. To use this, create a
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* struct that encapsulates the set of pointers you wish to walk through a
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* data structure, and implement both `MovePtr` for it as well as `TyVisitor`;
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* then build a MovePtrAdaptor wrapped around your struct.
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*/
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pub trait MovePtr {
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fn move_ptr(adjustment: fn(*c_void) -> *c_void);
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}
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/// Helper function for alignment calculation.
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#[inline(always)]
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pub fn align(size: uint, align: uint) -> uint {
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((size + align) - 1u) & !(align - 1u)
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}
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/// Adaptor to wrap around visitors implementing MovePtr.
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pub struct MovePtrAdaptor<V: TyVisitor MovePtr> {
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inner: V
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}
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pub fn MovePtrAdaptor<V: TyVisitor MovePtr>(v: V) -> MovePtrAdaptor<V> {
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MovePtrAdaptor { inner: move v }
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}
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impl<V: TyVisitor MovePtr> MovePtrAdaptor<V> {
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#[inline(always)]
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fn bump(sz: uint) {
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do self.inner.move_ptr() |p| {
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((p as uint) + sz) as *c_void
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};
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}
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#[inline(always)]
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fn align(a: uint) {
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do self.inner.move_ptr() |p| {
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align(p as uint, a) as *c_void
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};
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}
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#[inline(always)]
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fn align_to<T>() {
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self.align(sys::min_align_of::<T>());
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}
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#[inline(always)]
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fn bump_past<T>() {
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self.bump(sys::size_of::<T>());
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}
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}
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/// Abstract type-directed pointer-movement using the MovePtr trait
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impl<V: TyVisitor MovePtr> MovePtrAdaptor<V>: TyVisitor {
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fn visit_bot() -> bool {
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self.align_to::<()>();
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if ! self.inner.visit_bot() { return false; }
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self.bump_past::<()>();
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true
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}
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fn visit_nil() -> bool {
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self.align_to::<()>();
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if ! self.inner.visit_nil() { return false; }
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self.bump_past::<()>();
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true
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}
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fn visit_bool() -> bool {
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self.align_to::<bool>();
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if ! self.inner.visit_bool() { return false; }
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self.bump_past::<bool>();
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true
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}
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fn visit_int() -> bool {
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self.align_to::<int>();
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if ! self.inner.visit_int() { return false; }
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self.bump_past::<int>();
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true
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}
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fn visit_i8() -> bool {
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self.align_to::<i8>();
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if ! self.inner.visit_i8() { return false; }
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self.bump_past::<i8>();
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true
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}
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fn visit_i16() -> bool {
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self.align_to::<i16>();
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if ! self.inner.visit_i16() { return false; }
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self.bump_past::<i16>();
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true
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}
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fn visit_i32() -> bool {
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self.align_to::<i32>();
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if ! self.inner.visit_i32() { return false; }
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self.bump_past::<i32>();
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true
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}
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fn visit_i64() -> bool {
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self.align_to::<i64>();
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if ! self.inner.visit_i64() { return false; }
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self.bump_past::<i64>();
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true
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}
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fn visit_uint() -> bool {
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self.align_to::<uint>();
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if ! self.inner.visit_uint() { return false; }
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self.bump_past::<uint>();
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true
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}
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fn visit_u8() -> bool {
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self.align_to::<u8>();
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if ! self.inner.visit_u8() { return false; }
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self.bump_past::<u8>();
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true
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}
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fn visit_u16() -> bool {
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self.align_to::<u16>();
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if ! self.inner.visit_u16() { return false; }
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self.bump_past::<u16>();
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true
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}
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fn visit_u32() -> bool {
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self.align_to::<u32>();
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if ! self.inner.visit_u32() { return false; }
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self.bump_past::<u32>();
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true
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}
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fn visit_u64() -> bool {
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self.align_to::<u64>();
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if ! self.inner.visit_u64() { return false; }
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self.bump_past::<u64>();
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true
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}
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fn visit_float() -> bool {
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self.align_to::<float>();
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if ! self.inner.visit_float() { return false; }
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self.bump_past::<float>();
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true
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}
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fn visit_f32() -> bool {
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self.align_to::<f32>();
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if ! self.inner.visit_f32() { return false; }
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self.bump_past::<f32>();
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true
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}
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fn visit_f64() -> bool {
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self.align_to::<f64>();
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if ! self.inner.visit_f64() { return false; }
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self.bump_past::<f64>();
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true
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}
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fn visit_char() -> bool {
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self.align_to::<char>();
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if ! self.inner.visit_char() { return false; }
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self.bump_past::<char>();
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true
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}
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fn visit_str() -> bool {
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self.align_to::<~str>();
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if ! self.inner.visit_str() { return false; }
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self.bump_past::<~str>();
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true
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}
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fn visit_estr_box() -> bool {
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self.align_to::<@str>();
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if ! self.inner.visit_estr_box() { return false; }
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self.bump_past::<@str>();
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true
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}
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fn visit_estr_uniq() -> bool {
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self.align_to::<~str>();
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if ! self.inner.visit_estr_uniq() { return false; }
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self.bump_past::<~str>();
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true
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}
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fn visit_estr_slice() -> bool {
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self.align_to::<&static/str>();
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if ! self.inner.visit_estr_slice() { return false; }
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self.bump_past::<&static/str>();
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true
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}
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fn visit_estr_fixed(n: uint,
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sz: uint,
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align: uint) -> bool {
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self.align(align);
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if ! self.inner.visit_estr_fixed(n, sz, align) { return false; }
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self.bump(sz);
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true
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}
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fn visit_box(mtbl: uint, inner: *TyDesc) -> bool {
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self.align_to::<@u8>();
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if ! self.inner.visit_box(mtbl, inner) { return false; }
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self.bump_past::<@u8>();
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true
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}
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fn visit_uniq(mtbl: uint, inner: *TyDesc) -> bool {
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self.align_to::<~u8>();
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if ! self.inner.visit_uniq(mtbl, inner) { return false; }
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self.bump_past::<~u8>();
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true
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}
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fn visit_ptr(mtbl: uint, inner: *TyDesc) -> bool {
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self.align_to::<*u8>();
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if ! self.inner.visit_ptr(mtbl, inner) { return false; }
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self.bump_past::<*u8>();
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true
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}
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fn visit_rptr(mtbl: uint, inner: *TyDesc) -> bool {
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self.align_to::<&static/u8>();
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if ! self.inner.visit_rptr(mtbl, inner) { return false; }
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self.bump_past::<&static/u8>();
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true
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}
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fn visit_unboxed_vec(mtbl: uint, inner: *TyDesc) -> bool {
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self.align_to::<vec::UnboxedVecRepr>();
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if ! self.inner.visit_vec(mtbl, inner) { return false; }
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true
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}
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fn visit_vec(mtbl: uint, inner: *TyDesc) -> bool {
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self.align_to::<~[u8]>();
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if ! self.inner.visit_vec(mtbl, inner) { return false; }
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self.bump_past::<~[u8]>();
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true
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}
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fn visit_evec_box(mtbl: uint, inner: *TyDesc) -> bool {
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self.align_to::<@[u8]>();
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if ! self.inner.visit_evec_box(mtbl, inner) { return false; }
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self.bump_past::<@[u8]>();
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true
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}
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fn visit_evec_uniq(mtbl: uint, inner: *TyDesc) -> bool {
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self.align_to::<~[u8]>();
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if ! self.inner.visit_evec_uniq(mtbl, inner) { return false; }
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self.bump_past::<~[u8]>();
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true
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}
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fn visit_evec_slice(mtbl: uint, inner: *TyDesc) -> bool {
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self.align_to::<&static/[u8]>();
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if ! self.inner.visit_evec_slice(mtbl, inner) { return false; }
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self.bump_past::<&static/[u8]>();
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true
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}
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fn visit_evec_fixed(n: uint, sz: uint, align: uint,
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mtbl: uint, inner: *TyDesc) -> bool {
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self.align(align);
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if ! self.inner.visit_evec_fixed(n, sz, align, mtbl, inner) {
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return false;
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}
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self.bump(sz);
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true
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}
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fn visit_enter_rec(n_fields: uint, sz: uint, align: uint) -> bool {
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self.align(align);
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if ! self.inner.visit_enter_rec(n_fields, sz, align) { return false; }
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true
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}
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fn visit_rec_field(i: uint, name: &str,
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mtbl: uint, inner: *TyDesc) -> bool {
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unsafe { self.align((*inner).align); }
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if ! self.inner.visit_rec_field(i, name, mtbl, inner) {
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return false;
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}
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unsafe { self.bump((*inner).size); }
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true
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}
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fn visit_leave_rec(n_fields: uint, sz: uint, align: uint) -> bool {
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if ! self.inner.visit_leave_rec(n_fields, sz, align) { return false; }
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true
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}
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fn visit_enter_class(n_fields: uint, sz: uint, align: uint) -> bool {
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self.align(align);
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if ! self.inner.visit_enter_class(n_fields, sz, align) {
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return false;
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}
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true
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}
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fn visit_class_field(i: uint, name: &str,
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mtbl: uint, inner: *TyDesc) -> bool {
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unsafe { self.align((*inner).align); }
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if ! self.inner.visit_class_field(i, name, mtbl, inner) {
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return false;
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}
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unsafe { self.bump((*inner).size); }
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true
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}
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fn visit_leave_class(n_fields: uint, sz: uint, align: uint) -> bool {
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if ! self.inner.visit_leave_class(n_fields, sz, align) {
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return false;
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}
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true
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}
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fn visit_enter_tup(n_fields: uint, sz: uint, align: uint) -> bool {
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self.align(align);
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if ! self.inner.visit_enter_tup(n_fields, sz, align) { return false; }
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true
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}
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fn visit_tup_field(i: uint, inner: *TyDesc) -> bool {
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unsafe { self.align((*inner).align); }
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if ! self.inner.visit_tup_field(i, inner) { return false; }
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unsafe { self.bump((*inner).size); }
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true
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}
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fn visit_leave_tup(n_fields: uint, sz: uint, align: uint) -> bool {
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if ! self.inner.visit_leave_tup(n_fields, sz, align) { return false; }
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true
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}
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fn visit_enter_fn(purity: uint, proto: uint,
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n_inputs: uint, retstyle: uint) -> bool {
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if ! self.inner.visit_enter_fn(purity, proto, n_inputs, retstyle) {
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return false
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}
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true
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}
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fn visit_fn_input(i: uint, mode: uint, inner: *TyDesc) -> bool {
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if ! self.inner.visit_fn_input(i, mode, inner) { return false; }
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true
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}
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fn visit_fn_output(retstyle: uint, inner: *TyDesc) -> bool {
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if ! self.inner.visit_fn_output(retstyle, inner) { return false; }
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true
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}
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fn visit_leave_fn(purity: uint, proto: uint,
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n_inputs: uint, retstyle: uint) -> bool {
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if ! self.inner.visit_leave_fn(purity, proto, n_inputs, retstyle) {
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return false;
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}
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true
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}
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fn visit_enter_enum(n_variants: uint, sz: uint, align: uint) -> bool {
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self.align(align);
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if ! self.inner.visit_enter_enum(n_variants, sz, align) {
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return false;
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}
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true
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}
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fn visit_enter_enum_variant(variant: uint,
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disr_val: int,
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n_fields: uint,
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name: &str) -> bool {
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if ! self.inner.visit_enter_enum_variant(variant, disr_val,
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n_fields, name) {
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return false;
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}
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true
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}
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fn visit_enum_variant_field(i: uint, inner: *TyDesc) -> bool {
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if ! self.inner.visit_enum_variant_field(i, inner) { return false; }
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true
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}
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fn visit_leave_enum_variant(variant: uint,
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disr_val: int,
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n_fields: uint,
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name: &str) -> bool {
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if ! self.inner.visit_leave_enum_variant(variant, disr_val,
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n_fields, name) {
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return false;
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}
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true
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}
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fn visit_leave_enum(n_variants: uint, sz: uint, align: uint) -> bool {
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if ! self.inner.visit_leave_enum(n_variants, sz, align) {
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return false;
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}
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true
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}
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fn visit_trait() -> bool {
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self.align_to::<TyVisitor>();
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if ! self.inner.visit_trait() { return false; }
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self.bump_past::<TyVisitor>();
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true
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}
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fn visit_var() -> bool {
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if ! self.inner.visit_var() { return false; }
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true
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}
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fn visit_var_integral() -> bool {
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if ! self.inner.visit_var_integral() { return false; }
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true
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}
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fn visit_param(i: uint) -> bool {
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if ! self.inner.visit_param(i) { return false; }
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true
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}
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fn visit_self() -> bool {
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self.align_to::<&static/u8>();
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if ! self.inner.visit_self() { return false; }
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self.align_to::<&static/u8>();
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true
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}
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fn visit_type() -> bool {
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if ! self.inner.visit_type() { return false; }
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true
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}
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fn visit_opaque_box() -> bool {
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self.align_to::<@u8>();
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if ! self.inner.visit_opaque_box() { return false; }
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self.bump_past::<@u8>();
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true
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}
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fn visit_constr(inner: *TyDesc) -> bool {
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if ! self.inner.visit_constr(inner) { return false; }
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true
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}
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fn visit_closure_ptr(ck: uint) -> bool {
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self.align_to::<fn@()>();
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if ! self.inner.visit_closure_ptr(ck) { return false; }
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self.bump_past::<fn@()>();
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true
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}
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}
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