733 lines
21 KiB
Rust
733 lines
21 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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More runtime type reflection
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*/
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use cast::transmute;
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use char;
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use intrinsic;
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use intrinsic::{TyDesc, TyVisitor, visit_tydesc};
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#[cfg(not(stage0))] use intrinsic::Opaque;
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use io::{Writer, WriterUtil};
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use libc::c_void;
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use managed;
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use ptr;
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#[cfg(stage0)] use sys;
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use reflect;
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use reflect::{MovePtr, align};
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use to_str::ToStr;
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use vec::UnboxedVecRepr;
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use vec::raw::{VecRepr, SliceRepr};
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use vec;
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#[cfg(test)] use io;
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pub use managed::raw::BoxRepr;
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/// Helpers
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trait EscapedCharWriter {
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fn write_escaped_char(&self, ch: char);
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}
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impl EscapedCharWriter for @Writer {
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fn write_escaped_char(&self, ch: char) {
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match ch {
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'\t' => self.write_str("\\t"),
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'\r' => self.write_str("\\r"),
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'\n' => self.write_str("\\n"),
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'\\' => self.write_str("\\\\"),
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'\'' => self.write_str("\\'"),
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'"' => self.write_str("\\\""),
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'\x20'..'\x7e' => self.write_char(ch),
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_ => {
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// FIXME #4423: This is inefficient because it requires a
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// malloc.
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self.write_str(char::escape_unicode(ch))
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}
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}
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}
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}
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/// Representations
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trait Repr {
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fn write_repr(&self, writer: @Writer);
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}
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impl Repr for () {
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fn write_repr(&self, writer: @Writer) { writer.write_str("()"); }
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}
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impl Repr for bool {
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fn write_repr(&self, writer: @Writer) {
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writer.write_str(if *self { "true" } else { "false" })
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}
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}
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impl Repr for int {
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fn write_repr(&self, writer: @Writer) { writer.write_int(*self); }
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}
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impl Repr for i8 {
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fn write_repr(&self, writer: @Writer) { writer.write_int(*self as int); }
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}
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impl Repr for i16 {
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fn write_repr(&self, writer: @Writer) { writer.write_int(*self as int); }
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}
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impl Repr for i32 {
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fn write_repr(&self, writer: @Writer) { writer.write_int(*self as int); }
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}
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impl Repr for i64 {
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// FIXME #4424: This can lose precision.
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fn write_repr(&self, writer: @Writer) { writer.write_int(*self as int); }
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}
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impl Repr for uint {
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fn write_repr(&self, writer: @Writer) { writer.write_uint(*self); }
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}
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impl Repr for u8 {
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fn write_repr(&self, writer: @Writer) {
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writer.write_uint(*self as uint);
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}
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}
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impl Repr for u16 {
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fn write_repr(&self, writer: @Writer) {
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writer.write_uint(*self as uint);
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}
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}
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impl Repr for u32 {
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fn write_repr(&self, writer: @Writer) {
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writer.write_uint(*self as uint);
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}
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}
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impl Repr for u64 {
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// FIXME #4424: This can lose precision.
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fn write_repr(&self, writer: @Writer) {
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writer.write_uint(*self as uint);
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}
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}
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impl Repr for float {
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// FIXME #4423: This mallocs.
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fn write_repr(&self, writer: @Writer) { writer.write_str(self.to_str()); }
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}
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impl Repr for f32 {
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// FIXME #4423 This mallocs.
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fn write_repr(&self, writer: @Writer) { writer.write_str(self.to_str()); }
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}
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impl Repr for f64 {
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// FIXME #4423: This mallocs.
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fn write_repr(&self, writer: @Writer) { writer.write_str(self.to_str()); }
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}
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impl Repr for char {
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fn write_repr(&self, writer: @Writer) { writer.write_char(*self); }
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}
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// New implementation using reflect::MovePtr
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#[cfg(stage0)]
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enum VariantState {
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Degenerate,
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TagMatch,
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TagMismatch,
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}
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#[cfg(not(stage0))]
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enum VariantState {
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SearchingFor(int),
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Matched,
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AlreadyFound
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}
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pub struct ReprVisitor {
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mut ptr: *c_void,
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mut ptr_stk: ~[*c_void],
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mut var_stk: ~[VariantState],
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writer: @Writer
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}
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pub fn ReprVisitor(ptr: *c_void, writer: @Writer) -> ReprVisitor {
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ReprVisitor { ptr: ptr,
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ptr_stk: ~[],
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var_stk: ~[],
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writer: writer }
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}
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impl MovePtr for ReprVisitor {
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#[inline(always)]
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fn move_ptr(&self, adjustment: &fn(*c_void) -> *c_void) {
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self.ptr = adjustment(self.ptr);
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}
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fn push_ptr(&self) {
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self.ptr_stk.push(self.ptr);
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}
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fn pop_ptr(&self) {
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self.ptr = self.ptr_stk.pop();
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}
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}
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pub impl ReprVisitor {
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// Various helpers for the TyVisitor impl
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#[inline(always)]
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fn get<T>(&self, f: &fn(&T)) -> bool {
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unsafe {
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f(transmute::<*c_void,&T>(copy self.ptr));
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}
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true
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}
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#[cfg(stage0)] #[inline(always)]
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fn bump(&self, sz: uint) {
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do self.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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#[cfg(stage0)] #[inline(always)]
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fn bump_past<T>(&self) {
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self.bump(sys::size_of::<T>());
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}
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#[inline(always)]
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fn visit_inner(&self, inner: *TyDesc) -> bool {
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self.visit_ptr_inner(self.ptr, inner)
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}
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#[inline(always)]
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fn visit_ptr_inner(&self, ptr: *c_void, inner: *TyDesc) -> bool {
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unsafe {
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let mut u = ReprVisitor(ptr, self.writer);
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let v = reflect::MovePtrAdaptor(u);
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visit_tydesc(inner, @v as @TyVisitor);
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true
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}
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}
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#[inline(always)]
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fn write<T:Repr>(&self) -> bool {
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do self.get |v:&T| {
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v.write_repr(self.writer);
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}
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}
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fn write_escaped_slice(&self, slice: &str) {
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self.writer.write_char('"');
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for slice.each_char |ch| {
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self.writer.write_escaped_char(ch);
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}
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self.writer.write_char('"');
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}
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fn write_mut_qualifier(&self, mtbl: uint) {
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if mtbl == 0 {
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self.writer.write_str("mut ");
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} else if mtbl == 1 {
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// skip, this is ast::m_imm
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} else {
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assert!(mtbl == 2);
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self.writer.write_str("const ");
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}
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}
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fn write_vec_range(&self, mtbl: uint, ptr: *u8, len: uint,
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inner: *TyDesc) -> bool {
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let mut p = ptr;
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let end = ptr::offset(p, len);
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let (sz, al) = unsafe { ((*inner).size, (*inner).align) };
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self.writer.write_char('[');
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let mut first = true;
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while (p as uint) < (end as uint) {
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if first {
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first = false;
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} else {
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self.writer.write_str(", ");
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}
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self.write_mut_qualifier(mtbl);
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self.visit_ptr_inner(p as *c_void, inner);
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p = align(ptr::offset(p, sz) as uint, al) as *u8;
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}
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self.writer.write_char(']');
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true
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}
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fn write_unboxed_vec_repr(&self, mtbl: uint, v: &UnboxedVecRepr,
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inner: *TyDesc) -> bool {
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self.write_vec_range(mtbl, ptr::to_unsafe_ptr(&v.data),
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v.fill, inner)
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}
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}
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impl TyVisitor for ReprVisitor {
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fn visit_bot(&self) -> bool {
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self.writer.write_str("!");
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true
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}
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fn visit_nil(&self) -> bool { self.write::<()>() }
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fn visit_bool(&self) -> bool { self.write::<bool>() }
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fn visit_int(&self) -> bool { self.write::<int>() }
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fn visit_i8(&self) -> bool { self.write::<i8>() }
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fn visit_i16(&self) -> bool { self.write::<i16>() }
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fn visit_i32(&self) -> bool { self.write::<i32>() }
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fn visit_i64(&self) -> bool { self.write::<i64>() }
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fn visit_uint(&self) -> bool { self.write::<uint>() }
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fn visit_u8(&self) -> bool { self.write::<u8>() }
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fn visit_u16(&self) -> bool { self.write::<u16>() }
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fn visit_u32(&self) -> bool { self.write::<u32>() }
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fn visit_u64(&self) -> bool { self.write::<u64>() }
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fn visit_float(&self) -> bool { self.write::<float>() }
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fn visit_f32(&self) -> bool { self.write::<f32>() }
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fn visit_f64(&self) -> bool { self.write::<f64>() }
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fn visit_char(&self) -> bool {
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do self.get::<char> |&ch| {
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self.writer.write_char('\'');
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self.writer.write_escaped_char(ch);
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self.writer.write_char('\'');
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}
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}
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// Type no longer exists, vestigial function.
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fn visit_str(&self) -> bool { fail!(); }
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fn visit_estr_box(&self) -> bool {
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do self.get::<@str> |s| {
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self.writer.write_char('@');
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self.write_escaped_slice(*s);
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}
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}
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fn visit_estr_uniq(&self) -> bool {
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do self.get::<~str> |s| {
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self.writer.write_char('~');
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self.write_escaped_slice(*s);
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}
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}
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fn visit_estr_slice(&self) -> bool {
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do self.get::<&str> |s| {
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self.write_escaped_slice(*s);
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}
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}
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// Type no longer exists, vestigial function.
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fn visit_estr_fixed(&self, _n: uint, _sz: uint,
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_align: uint) -> bool { fail!(); }
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fn visit_box(&self, mtbl: uint, inner: *TyDesc) -> bool {
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self.writer.write_char('@');
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self.write_mut_qualifier(mtbl);
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do self.get::<&managed::raw::BoxRepr> |b| {
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let p = ptr::to_unsafe_ptr(&b.data) as *c_void;
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self.visit_ptr_inner(p, inner);
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}
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}
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fn visit_uniq(&self, mtbl: uint, inner: *TyDesc) -> bool {
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self.writer.write_char('~');
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self.write_mut_qualifier(mtbl);
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do self.get::<&managed::raw::BoxRepr> |b| {
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let p = ptr::to_unsafe_ptr(&b.data) as *c_void;
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self.visit_ptr_inner(p, inner);
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}
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}
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fn visit_ptr(&self, _mtbl: uint, _inner: *TyDesc) -> bool {
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do self.get::<*c_void> |p| {
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self.writer.write_str(fmt!("(0x%x as *())",
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*p as uint));
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}
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}
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fn visit_rptr(&self, mtbl: uint, inner: *TyDesc) -> bool {
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self.writer.write_char('&');
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self.write_mut_qualifier(mtbl);
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do self.get::<*c_void> |p| {
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self.visit_ptr_inner(*p, inner);
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}
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}
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// Type no longer exists, vestigial function.
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fn visit_vec(&self, _mtbl: uint, _inner: *TyDesc) -> bool { fail!(); }
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fn visit_unboxed_vec(&self, mtbl: uint, inner: *TyDesc) -> bool {
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do self.get::<vec::UnboxedVecRepr> |b| {
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self.write_unboxed_vec_repr(mtbl, b, inner);
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}
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}
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fn visit_evec_box(&self, mtbl: uint, inner: *TyDesc) -> bool {
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do self.get::<&VecRepr> |b| {
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self.writer.write_char('@');
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self.write_unboxed_vec_repr(mtbl, &b.unboxed, inner);
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}
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}
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fn visit_evec_uniq(&self, mtbl: uint, inner: *TyDesc) -> bool {
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do self.get::<&VecRepr> |b| {
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self.writer.write_char('~');
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self.write_unboxed_vec_repr(mtbl, &b.unboxed, inner);
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}
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}
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fn visit_evec_slice(&self, mtbl: uint, inner: *TyDesc) -> bool {
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do self.get::<SliceRepr> |s| {
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self.writer.write_char('&');
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self.write_vec_range(mtbl, s.data, s.len, inner);
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}
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}
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fn visit_evec_fixed(&self, _n: uint, sz: uint, _align: uint,
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mtbl: uint, inner: *TyDesc) -> bool {
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do self.get::<u8> |b| {
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self.write_vec_range(mtbl, ptr::to_unsafe_ptr(b), sz, inner);
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}
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}
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fn visit_enter_rec(&self, _n_fields: uint,
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_sz: uint, _align: uint) -> bool {
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self.writer.write_char('{');
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true
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}
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fn visit_rec_field(&self, i: uint, name: &str,
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mtbl: uint, inner: *TyDesc) -> bool {
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if i != 0 {
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self.writer.write_str(", ");
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}
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self.write_mut_qualifier(mtbl);
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self.writer.write_str(name);
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self.writer.write_str(": ");
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self.visit_inner(inner);
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true
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}
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fn visit_leave_rec(&self, _n_fields: uint,
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_sz: uint, _align: uint) -> bool {
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self.writer.write_char('}');
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true
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}
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fn visit_enter_class(&self, _n_fields: uint,
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_sz: uint, _align: uint) -> bool {
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self.writer.write_char('{');
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true
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}
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fn visit_class_field(&self, i: uint, name: &str,
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mtbl: uint, inner: *TyDesc) -> bool {
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if i != 0 {
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self.writer.write_str(", ");
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}
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self.write_mut_qualifier(mtbl);
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self.writer.write_str(name);
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self.writer.write_str(": ");
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self.visit_inner(inner);
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true
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}
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fn visit_leave_class(&self, _n_fields: uint,
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_sz: uint, _align: uint) -> bool {
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self.writer.write_char('}');
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true
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}
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fn visit_enter_tup(&self, _n_fields: uint,
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_sz: uint, _align: uint) -> bool {
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self.writer.write_char('(');
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true
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}
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fn visit_tup_field(&self, i: uint, inner: *TyDesc) -> bool {
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if i != 0 {
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self.writer.write_str(", ");
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}
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self.visit_inner(inner);
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true
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}
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fn visit_leave_tup(&self, _n_fields: uint,
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_sz: uint, _align: uint) -> bool {
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if _n_fields == 1 {
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self.writer.write_char(',');
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}
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self.writer.write_char(')');
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true
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}
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|
|
#[cfg(stage0)]
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fn visit_enter_enum(&self, n_variants: uint,
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_sz: uint, _align: uint) -> bool {
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|
if n_variants == 1 {
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self.var_stk.push(Degenerate)
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} else {
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self.var_stk.push(TagMatch)
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}
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true
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}
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|
|
#[cfg(not(stage0))]
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|
fn visit_enter_enum(&self, _n_variants: uint,
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get_disr: extern unsafe fn(ptr: *Opaque) -> int,
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_sz: uint, _align: uint) -> bool {
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let disr = unsafe { get_disr(transmute(self.ptr)) };
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self.var_stk.push(SearchingFor(disr));
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true
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}
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|
|
#[cfg(stage0)]
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fn visit_enter_enum_variant(&self, _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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let mut write = false;
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match self.var_stk.pop() {
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Degenerate => {
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write = true;
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self.var_stk.push(Degenerate);
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}
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|
TagMatch | TagMismatch => {
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do self.get::<int>() |t| {
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if disr_val == *t {
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write = true;
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self.var_stk.push(TagMatch);
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} else {
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self.var_stk.push(TagMismatch);
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}
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};
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self.bump_past::<int>();
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}
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}
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|
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if write {
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self.writer.write_str(name);
|
|
if n_fields > 0 {
|
|
self.writer.write_char('(');
|
|
}
|
|
}
|
|
true
|
|
}
|
|
|
|
#[cfg(not(stage0))]
|
|
fn visit_enter_enum_variant(&self, _variant: uint,
|
|
disr_val: int,
|
|
n_fields: uint,
|
|
name: &str) -> bool {
|
|
let mut write = false;
|
|
match self.var_stk.pop() {
|
|
SearchingFor(sought) => {
|
|
if disr_val == sought {
|
|
self.var_stk.push(Matched);
|
|
write = true;
|
|
} else {
|
|
self.var_stk.push(SearchingFor(sought));
|
|
}
|
|
}
|
|
Matched | AlreadyFound => {
|
|
self.var_stk.push(AlreadyFound);
|
|
}
|
|
}
|
|
|
|
if write {
|
|
self.writer.write_str(name);
|
|
if n_fields > 0 {
|
|
self.writer.write_char('(');
|
|
}
|
|
}
|
|
true
|
|
}
|
|
|
|
#[cfg(stage0)]
|
|
fn visit_enum_variant_field(&self, i: uint, inner: *TyDesc) -> bool {
|
|
match self.var_stk[vec::uniq_len(&const self.var_stk) - 1] {
|
|
Degenerate | TagMatch => {
|
|
if i != 0 {
|
|
self.writer.write_str(", ");
|
|
}
|
|
if ! self.visit_inner(inner) {
|
|
return false;
|
|
}
|
|
}
|
|
TagMismatch => ()
|
|
}
|
|
true
|
|
}
|
|
|
|
#[cfg(not(stage0))]
|
|
fn visit_enum_variant_field(&self, i: uint, _offset: uint, inner: *TyDesc) -> bool {
|
|
match self.var_stk[vec::uniq_len(&const self.var_stk) - 1] {
|
|
Matched => {
|
|
if i != 0 {
|
|
self.writer.write_str(", ");
|
|
}
|
|
if ! self.visit_inner(inner) {
|
|
return false;
|
|
}
|
|
}
|
|
_ => ()
|
|
}
|
|
true
|
|
}
|
|
|
|
#[cfg(stage0)]
|
|
fn visit_leave_enum_variant(&self, _variant: uint,
|
|
_disr_val: int,
|
|
n_fields: uint,
|
|
_name: &str) -> bool {
|
|
match self.var_stk[vec::uniq_len(&const self.var_stk) - 1] {
|
|
Degenerate | TagMatch => {
|
|
if n_fields > 0 {
|
|
self.writer.write_char(')');
|
|
}
|
|
}
|
|
TagMismatch => ()
|
|
}
|
|
true
|
|
}
|
|
|
|
#[cfg(not(stage0))]
|
|
fn visit_leave_enum_variant(&self, _variant: uint,
|
|
_disr_val: int,
|
|
n_fields: uint,
|
|
_name: &str) -> bool {
|
|
match self.var_stk[vec::uniq_len(&const self.var_stk) - 1] {
|
|
Matched => {
|
|
if n_fields > 0 {
|
|
self.writer.write_char(')');
|
|
}
|
|
}
|
|
_ => ()
|
|
}
|
|
true
|
|
}
|
|
|
|
#[cfg(stage0)]
|
|
fn visit_leave_enum(&self, _n_variants: uint,
|
|
_sz: uint, _align: uint) -> bool {
|
|
self.var_stk.pop();
|
|
true
|
|
}
|
|
|
|
#[cfg(not(stage0))]
|
|
fn visit_leave_enum(&self, _n_variants: uint,
|
|
_get_disr: extern unsafe fn(ptr: *Opaque) -> int,
|
|
_sz: uint, _align: uint) -> bool {
|
|
match self.var_stk.pop() {
|
|
SearchingFor(*) => fail!(~"enum value matched no variant"),
|
|
_ => true
|
|
}
|
|
}
|
|
|
|
fn visit_enter_fn(&self, _purity: uint, _proto: uint,
|
|
_n_inputs: uint, _retstyle: uint) -> bool { true }
|
|
fn visit_fn_input(&self, _i: uint, _mode: uint, _inner: *TyDesc) -> bool {
|
|
true
|
|
}
|
|
fn visit_fn_output(&self, _retstyle: uint, _inner: *TyDesc) -> bool {
|
|
true
|
|
}
|
|
fn visit_leave_fn(&self, _purity: uint, _proto: uint,
|
|
_n_inputs: uint, _retstyle: uint) -> bool { true }
|
|
|
|
|
|
fn visit_trait(&self) -> bool { true }
|
|
fn visit_var(&self) -> bool { true }
|
|
fn visit_var_integral(&self) -> bool { true }
|
|
fn visit_param(&self, _i: uint) -> bool { true }
|
|
fn visit_self(&self) -> bool { true }
|
|
fn visit_type(&self) -> bool { true }
|
|
|
|
fn visit_opaque_box(&self) -> bool {
|
|
self.writer.write_char('@');
|
|
do self.get::<&managed::raw::BoxRepr> |b| {
|
|
let p = ptr::to_unsafe_ptr(&b.data) as *c_void;
|
|
self.visit_ptr_inner(p, b.header.type_desc);
|
|
}
|
|
}
|
|
|
|
// Type no longer exists, vestigial function.
|
|
fn visit_constr(&self, _inner: *TyDesc) -> bool { fail!(); }
|
|
|
|
fn visit_closure_ptr(&self, _ck: uint) -> bool { true }
|
|
}
|
|
|
|
pub fn write_repr<T>(writer: @Writer, object: &T) {
|
|
unsafe {
|
|
let ptr = ptr::to_unsafe_ptr(object) as *c_void;
|
|
let tydesc = intrinsic::get_tydesc::<T>();
|
|
let mut u = ReprVisitor(ptr, writer);
|
|
let v = reflect::MovePtrAdaptor(u);
|
|
visit_tydesc(tydesc, @v as @TyVisitor)
|
|
}
|
|
}
|
|
|
|
#[test]
|
|
struct P {a: int, b: float}
|
|
|
|
#[test]
|
|
fn test_repr() {
|
|
|
|
fn exact_test<T>(t: &T, e:&str) {
|
|
let s : &str = io::with_str_writer(|w| write_repr(w, t));
|
|
if s != e {
|
|
error!("expected '%s', got '%s'",
|
|
e, s);
|
|
}
|
|
assert!(s == e);
|
|
}
|
|
|
|
exact_test(&10, "10");
|
|
exact_test(&true, "true");
|
|
exact_test(&false, "false");
|
|
exact_test(&1.234, "1.234");
|
|
exact_test(&(&"hello"), "\"hello\"");
|
|
exact_test(&(@"hello"), "@\"hello\"");
|
|
exact_test(&(~"he\u10f3llo"), "~\"he\\u10f3llo\"");
|
|
|
|
// FIXME #4210: the mut fields are a bit off here.
|
|
exact_test(&(@10), "@10");
|
|
exact_test(&(@mut 10), "@10");
|
|
exact_test(&(~10), "~10");
|
|
exact_test(&(&10), "&10");
|
|
let mut x = 10;
|
|
exact_test(&(&mut x), "&mut 10");
|
|
|
|
exact_test(&(1,), "(1,)");
|
|
exact_test(&(@[1,2,3,4,5,6,7,8]),
|
|
"@[1, 2, 3, 4, 5, 6, 7, 8]");
|
|
exact_test(&(@[1u8,2u8,3u8,4u8]),
|
|
"@[1, 2, 3, 4]");
|
|
exact_test(&(@["hi", "there"]),
|
|
"@[\"hi\", \"there\"]");
|
|
exact_test(&(~["hi", "there"]),
|
|
"~[\"hi\", \"there\"]");
|
|
exact_test(&(&["hi", "there"]),
|
|
"&[\"hi\", \"there\"]");
|
|
exact_test(&(P{a:10, b:1.234}),
|
|
"{a: 10, b: 1.234}");
|
|
exact_test(&(@P{a:10, b:1.234}),
|
|
"@{a: 10, b: 1.234}");
|
|
exact_test(&(~P{a:10, b:1.234}),
|
|
"~{a: 10, b: 1.234}");
|
|
exact_test(&(10_u8, ~"hello"),
|
|
"(10, ~\"hello\")");
|
|
exact_test(&(10_u16, ~"hello"),
|
|
"(10, ~\"hello\")");
|
|
exact_test(&(10_u32, ~"hello"),
|
|
"(10, ~\"hello\")");
|
|
exact_test(&(10_u64, ~"hello"),
|
|
"(10, ~\"hello\")");
|
|
}
|