616 lines
17 KiB
Rust
616 lines
17 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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#[forbid(deprecated_mode)];
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#[forbid(deprecated_pattern)];
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use cast::transmute;
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use cast;
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use char;
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use dvec::DVec;
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use intrinsic;
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use intrinsic::{TyDesc, TyVisitor, visit_tydesc};
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use io;
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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 managed::raw::BoxHeaderRepr;
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use ptr;
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use reflect;
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use reflect::{MovePtr, MovePtrAdaptor, align};
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use repr;
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use str;
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use sys;
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use sys::TypeDesc;
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use to_str::ToStr;
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use uint;
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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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pub use managed::raw::BoxRepr;
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/// Helpers
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trait EscapedCharWriter {
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fn write_escaped_char(ch: char);
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}
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impl Writer : EscapedCharWriter {
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fn write_escaped_char(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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// XXX: This is inefficient because it requires a 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(writer: @Writer);
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}
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impl () : Repr {
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fn write_repr(writer: @Writer) { writer.write_str("()"); }
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}
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impl bool : Repr {
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fn write_repr(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 int : Repr {
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fn write_repr(writer: @Writer) { writer.write_int(self); }
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}
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impl i8 : Repr {
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fn write_repr(writer: @Writer) { writer.write_int(self as int); }
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}
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impl i16 : Repr {
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fn write_repr(writer: @Writer) { writer.write_int(self as int); }
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}
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impl i32 : Repr {
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fn write_repr(writer: @Writer) { writer.write_int(self as int); }
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}
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impl i64 : Repr {
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// XXX: This can lose precision.
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fn write_repr(writer: @Writer) { writer.write_int(self as int); }
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}
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impl uint : Repr {
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fn write_repr(writer: @Writer) { writer.write_uint(self); }
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}
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impl u8 : Repr {
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fn write_repr(writer: @Writer) { writer.write_uint(self as uint); }
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}
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impl u16 : Repr {
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fn write_repr(writer: @Writer) { writer.write_uint(self as uint); }
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}
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impl u32 : Repr {
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fn write_repr(writer: @Writer) { writer.write_uint(self as uint); }
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}
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impl u64 : Repr {
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// XXX: This can lose precision.
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fn write_repr(writer: @Writer) { writer.write_uint(self as uint); }
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}
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impl float : Repr {
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// XXX: This mallocs.
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fn write_repr(writer: @Writer) { writer.write_str(self.to_str()); }
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}
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impl f32 : Repr {
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// XXX: This mallocs.
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fn write_repr(writer: @Writer) { writer.write_str(self.to_str()); }
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}
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impl f64 : Repr {
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// XXX: This mallocs.
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fn write_repr(writer: @Writer) { writer.write_str(self.to_str()); }
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}
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impl char : Repr {
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fn write_repr(writer: @Writer) { writer.write_char(self); }
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}
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// New implementation using reflect::MovePtr
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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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pub struct ReprVisitor {
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mut ptr: *c_void,
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ptr_stk: DVec<*c_void>,
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var_stk: DVec<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: DVec(),
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var_stk: DVec(),
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writer: writer }
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}
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impl ReprVisitor : MovePtr {
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#[inline(always)]
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fn move_ptr(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() {
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self.ptr_stk.push(self.ptr);
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}
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fn pop_ptr() {
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self.ptr = self.ptr_stk.pop();
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}
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}
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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>(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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#[inline(always)]
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fn bump(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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#[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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#[inline(always)]
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fn visit_inner(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(ptr: *c_void, inner: *TyDesc) -> bool {
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let mut u = ReprVisitor(ptr, self.writer);
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let v = reflect::MovePtrAdaptor(move u);
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visit_tydesc(inner, (move v) as @TyVisitor);
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true
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}
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#[inline(always)]
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fn write<T:Repr>() -> 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(slice: &str) {
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self.writer.write_char('"');
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for str::chars_each(slice) |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(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(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(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 ReprVisitor : TyVisitor {
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fn visit_bot() -> 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() -> bool { self.write::<()>() }
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fn visit_bool() -> bool { self.write::<bool>() }
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fn visit_int() -> bool { self.write::<int>() }
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fn visit_i8() -> bool { self.write::<i8>() }
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fn visit_i16() -> bool { self.write::<i16>() }
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fn visit_i32() -> bool { self.write::<i32>() }
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fn visit_i64() -> bool { self.write::<i64>() }
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fn visit_uint() -> bool { self.write::<uint>() }
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fn visit_u8() -> bool { self.write::<u8>() }
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fn visit_u16() -> bool { self.write::<u16>() }
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fn visit_u32() -> bool { self.write::<u32>() }
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fn visit_u64() -> bool { self.write::<u64>() }
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fn visit_float() -> bool { self.write::<float>() }
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fn visit_f32() -> bool { self.write::<f32>() }
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fn visit_f64() -> bool { self.write::<f64>() }
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fn visit_char() -> bool { self.write::<uint>() }
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// Type no longer exists, vestigial function.
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fn visit_str() -> bool { fail; }
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fn visit_estr_box() -> 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() -> 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() -> 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(_n: uint, _sz: uint,
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_align: uint) -> bool { fail; }
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fn visit_box(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(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(_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(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(_mtbl: uint, _inner: *TyDesc) -> bool { fail; }
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fn visit_unboxed_vec(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(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(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(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(_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(_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(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(_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(_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(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(_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(_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(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(_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_enum(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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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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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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if write {
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self.writer.write_str(name);
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if n_fields > 0 {
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self.writer.write_char('(');
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}
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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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match self.var_stk.last() {
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Degenerate | TagMatch => {
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if i != 0 {
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self.writer.write_str(", ");
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}
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if ! self.visit_inner(inner) {
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return false;
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}
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}
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TagMismatch => ()
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}
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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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match self.var_stk.last() {
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Degenerate | TagMatch => {
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if n_fields > 0 {
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self.writer.write_char(')');
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}
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}
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TagMismatch => ()
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}
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true
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}
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fn visit_leave_enum(_n_variants: uint,
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_sz: uint, _align: uint) -> bool {
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self.var_stk.pop();
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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 { true }
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fn visit_fn_input(_i: uint, _mode: uint, _inner: *TyDesc) -> bool { true }
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fn visit_fn_output(_retstyle: uint, _inner: *TyDesc) -> bool { true }
|
|
fn visit_leave_fn(_purity: uint, _proto: uint,
|
|
_n_inputs: uint, _retstyle: uint) -> bool { true }
|
|
|
|
|
|
fn visit_trait() -> bool { true }
|
|
fn visit_var() -> bool { true }
|
|
fn visit_var_integral() -> bool { true }
|
|
fn visit_param(_i: uint) -> bool { true }
|
|
fn visit_self() -> bool { true }
|
|
fn visit_type() -> bool { true }
|
|
|
|
fn visit_opaque_box() -> 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(_inner: *TyDesc) -> bool { fail; }
|
|
|
|
fn visit_closure_ptr(_ck: uint) -> bool { true }
|
|
}
|
|
|
|
pub fn write_repr<T>(writer: @Writer, object: &T) {
|
|
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(move u);
|
|
visit_tydesc(tydesc, (move v) as @TyVisitor)
|
|
}
|
|
|
|
#[test]
|
|
fn test_repr() {
|
|
|
|
fn exact_test<T>(t: &T, e:&str) {
|
|
let s : &str = io::with_str_writer(|w| repr::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, "1.2340");
|
|
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(&(~mut 10), "~mut 10");
|
|
exact_test(&(&10), "&10");
|
|
let mut x = 10;
|
|
exact_test(&(&mut x), "&mut 10");
|
|
|
|
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(&({a:10, b:1.234}),
|
|
"{a: 10, b: 1.2340}");
|
|
exact_test(&(@{a:10, b:1.234}),
|
|
"@{a: 10, b: 1.2340}");
|
|
exact_test(&(~{a:10, b:1.234}),
|
|
"~{a: 10, b: 1.2340}");
|
|
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\")");
|
|
}
|