297 lines
8.5 KiB
Rust
297 lines
8.5 KiB
Rust
// Type encoding
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import std::io;
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import io::writer_util;
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import std::map::hashmap;
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import option::{some, none};
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import syntax::ast::*;
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import middle::ty;
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import syntax::print::pprust::*;
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export ctxt;
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export ty_abbrev;
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export ac_no_abbrevs;
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export ac_use_abbrevs;
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export enc_ty;
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export enc_bounds;
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type ctxt =
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// Def -> str Callback:
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// The type context.
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{ds: fn@(def_id) -> str, tcx: ty::ctxt, abbrevs: abbrev_ctxt};
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// Compact string representation for ty.t values. API ty_str & parse_from_str.
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// Extra parameters are for converting to/from def_ids in the string rep.
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// Whatever format you choose should not contain pipe characters.
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type ty_abbrev = {pos: uint, len: uint, s: @str};
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enum abbrev_ctxt { ac_no_abbrevs, ac_use_abbrevs(hashmap<ty::t, ty_abbrev>), }
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fn cx_uses_abbrevs(cx: @ctxt) -> bool {
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alt cx.abbrevs {
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ac_no_abbrevs { ret false; }
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ac_use_abbrevs(_) { ret true; }
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}
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}
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fn enc_ty(w: io::writer, cx: @ctxt, t: ty::t) {
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alt cx.abbrevs {
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ac_no_abbrevs {
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let result_str = alt cx.tcx.short_names_cache.find(t) {
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some(s) { *s }
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none {
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let buf = io::mk_mem_buffer();
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enc_sty(io::mem_buffer_writer(buf), cx,
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ty::struct_raw(cx.tcx, t));
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cx.tcx.short_names_cache.insert(t, @io::mem_buffer_str(buf));
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io::mem_buffer_str(buf)
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}
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};
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w.write_str(result_str);
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}
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ac_use_abbrevs(abbrevs) {
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alt abbrevs.find(t) {
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some(a) { w.write_str(*a.s); ret; }
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none {
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let pos = w.tell();
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enc_sty(w, cx, ty::struct_raw(cx.tcx, t));
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let end = w.tell();
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let len = end - pos;
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fn estimate_sz(u: uint) -> uint {
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let n = u;
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let len = 0u;
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while n != 0u { len += 1u; n = n >> 4u; }
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ret len;
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}
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let abbrev_len = 3u + estimate_sz(pos) + estimate_sz(len);
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if abbrev_len < len {
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// I.e. it's actually an abbreviation.
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let s = "#" + uint::to_str(pos, 16u) + ":" +
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uint::to_str(len, 16u) + "#";
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let a = {pos: pos, len: len, s: @s};
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abbrevs.insert(t, a);
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}
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ret;
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}
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}
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}
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}
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}
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fn enc_mt(w: io::writer, cx: @ctxt, mt: ty::mt) {
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alt mt.mut {
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imm { }
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mut { w.write_char('m'); }
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maybe_mut { w.write_char('?'); }
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}
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enc_ty(w, cx, mt.ty);
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}
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fn enc_sty(w: io::writer, cx: @ctxt, st: ty::sty) {
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alt st {
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ty::ty_nil { w.write_char('n'); }
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ty::ty_bot { w.write_char('z'); }
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ty::ty_bool { w.write_char('b'); }
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ty::ty_int(t) {
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alt t {
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ty_i { w.write_char('i'); }
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ty_char { w.write_char('c'); }
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ty_i8 { w.write_str("MB"); }
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ty_i16 { w.write_str("MW"); }
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ty_i32 { w.write_str("ML"); }
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ty_i64 { w.write_str("MD"); }
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}
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}
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ty::ty_uint(t) {
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alt t {
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ty_u { w.write_char('u'); }
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ty_u8 { w.write_str("Mb"); }
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ty_u16 { w.write_str("Mw"); }
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ty_u32 { w.write_str("Ml"); }
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ty_u64 { w.write_str("Md"); }
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}
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}
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ty::ty_float(t) {
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alt t {
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ty_f { w.write_char('l'); }
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ty_f32 { w.write_str("Mf"); }
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ty_f64 { w.write_str("MF"); }
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}
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}
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ty::ty_str { w.write_char('S'); }
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ty::ty_tag(def, tys) {
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w.write_str("t[");
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w.write_str(cx.ds(def));
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w.write_char('|');
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for t: ty::t in tys { enc_ty(w, cx, t); }
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w.write_char(']');
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}
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ty::ty_iface(def, tys) {
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w.write_str("x[");
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w.write_str(cx.ds(def));
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w.write_char('|');
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for t: ty::t in tys { enc_ty(w, cx, t); }
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w.write_char(']');
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}
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ty::ty_tup(ts) {
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w.write_str("T[");
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for t in ts { enc_ty(w, cx, t); }
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w.write_char(']');
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}
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ty::ty_box(mt) { w.write_char('@'); enc_mt(w, cx, mt); }
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ty::ty_uniq(mt) { w.write_char('~'); enc_mt(w, cx, mt); }
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ty::ty_ptr(mt) { w.write_char('*'); enc_mt(w, cx, mt); }
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ty::ty_vec(mt) { w.write_char('I'); enc_mt(w, cx, mt); }
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ty::ty_rec(fields) {
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w.write_str("R[");
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for field: ty::field in fields {
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w.write_str(field.ident);
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w.write_char('=');
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enc_mt(w, cx, field.mt);
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}
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w.write_char(']');
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}
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ty::ty_fn(f) {
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enc_proto(w, f.proto);
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enc_ty_fn(w, cx, f);
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}
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ty::ty_native_fn(args, out) {
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w.write_char('N');
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enc_ty_fn(w, cx, {proto: proto_bare, inputs: args, output: out,
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ret_style: return_val, constraints: []});
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}
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ty::ty_res(def, ty, tps) {
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w.write_str("r[");
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w.write_str(cx.ds(def));
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w.write_char('|');
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enc_ty(w, cx, ty);
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for t: ty::t in tps { enc_ty(w, cx, t); }
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w.write_char(']');
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}
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ty::ty_var(id) { w.write_char('X'); w.write_str(int::str(id)); }
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ty::ty_native(def) {
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w.write_char('E');
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w.write_str(cx.ds(def));
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w.write_char('|');
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}
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ty::ty_param(id, did) {
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w.write_char('p');
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w.write_str(cx.ds(did));
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w.write_char('|');
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w.write_str(uint::str(id));
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}
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ty::ty_type { w.write_char('Y'); }
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ty::ty_send_type { w.write_char('y'); }
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ty::ty_opaque_closure_ptr(ty::ck_block) { w.write_str("C&"); }
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ty::ty_opaque_closure_ptr(ty::ck_box) { w.write_str("C@"); }
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ty::ty_opaque_closure_ptr(ty::ck_uniq) { w.write_str("C~"); }
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ty::ty_constr(ty, cs) {
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w.write_str("A[");
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enc_ty(w, cx, ty);
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for tc: @ty::type_constr in cs { enc_ty_constr(w, cx, tc); }
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w.write_char(']');
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}
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ty::ty_named(t, name) {
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if cx.abbrevs != ac_no_abbrevs {
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w.write_char('"');
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w.write_str(*name);
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w.write_char('"');
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}
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enc_ty(w, cx, t);
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}
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}
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}
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fn enc_proto(w: io::writer, proto: proto) {
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alt proto {
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proto_uniq { w.write_str("f~"); }
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proto_box { w.write_str("f@"); }
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proto_block { w.write_str("f&"); }
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proto_any { w.write_str("f*"); }
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proto_bare { w.write_str("fn"); }
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}
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}
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fn enc_ty_fn(w: io::writer, cx: @ctxt, ft: ty::fn_ty) {
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w.write_char('[');
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for arg: ty::arg in ft.inputs {
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alt arg.mode {
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by_mut_ref { w.write_char('&'); }
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by_move { w.write_char('-'); }
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by_copy { w.write_char('+'); }
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by_ref { w.write_char('='); }
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by_val { w.write_char('#'); }
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}
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enc_ty(w, cx, arg.ty);
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}
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w.write_char(']');
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let colon = true;
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for c: @ty::constr in ft.constraints {
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if colon {
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w.write_char(':');
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colon = false;
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} else { w.write_char(';'); }
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enc_constr(w, cx, c);
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}
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alt ft.ret_style {
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noreturn { w.write_char('!'); }
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_ { enc_ty(w, cx, ft.output); }
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}
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}
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// FIXME less copy-and-paste
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fn enc_constr(w: io::writer, cx: @ctxt, c: @ty::constr) {
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w.write_str(path_to_str(c.node.path));
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w.write_char('(');
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w.write_str(cx.ds(c.node.id));
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w.write_char('|');
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let semi = false;
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for a: @constr_arg in c.node.args {
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if semi { w.write_char(';'); } else { semi = true; }
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alt a.node {
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carg_base { w.write_char('*'); }
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carg_ident(i) { w.write_uint(i); }
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carg_lit(l) { w.write_str(lit_to_str(l)); }
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}
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}
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w.write_char(')');
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}
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fn enc_ty_constr(w: io::writer, cx: @ctxt, c: @ty::type_constr) {
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w.write_str(path_to_str(c.node.path));
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w.write_char('(');
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w.write_str(cx.ds(c.node.id));
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w.write_char('|');
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let semi = false;
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for a: @ty::ty_constr_arg in c.node.args {
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if semi { w.write_char(';'); } else { semi = true; }
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alt a.node {
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carg_base { w.write_char('*'); }
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carg_ident(p) { w.write_str(path_to_str(p)); }
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carg_lit(l) { w.write_str(lit_to_str(l)); }
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}
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}
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w.write_char(')');
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}
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fn enc_bounds(w: io::writer, cx: @ctxt, bs: @[ty::param_bound]) {
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for bound in *bs {
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alt bound {
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ty::bound_send { w.write_char('S'); }
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ty::bound_copy { w.write_char('C'); }
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ty::bound_iface(tp) {
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w.write_char('I');
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enc_ty(w, cx, tp);
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}
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}
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}
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w.write_char('.');
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}
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//
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// Local Variables:
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// mode: rust
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// fill-column: 78;
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// indent-tabs-mode: nil
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// c-basic-offset: 4
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// buffer-file-coding-system: utf-8-unix
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// End:
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//
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