08237cad8d
Previously, the parser would not allow you to simultaneously implement a
function with a different abi as well as being unsafe at the same time. This
extends the parser to allow functions of the form:
unsafe extern fn foo() {
// ...
}
The closure type grammar was also changed to reflect this reversal, types
previously written as "extern unsafe fn()" must now be written as
"unsafe extern fn()". The parser currently has a hack which allows the old
style, but this will go away once a snapshot has landed.
Closes #10025
[breaking-change]
408 lines
16 KiB
Rust
408 lines
16 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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use back::link::mangle_internal_name_by_path_and_seq;
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use lib::llvm::{ValueRef, llvm};
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use middle::trans::adt;
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use middle::trans::base::*;
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use middle::trans::build::*;
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use middle::trans::callee::ArgVals;
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use middle::trans::callee;
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use middle::trans::common::*;
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use middle::trans::datum::*;
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use middle::trans::glue;
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use middle::trans::machine;
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use middle::trans::meth;
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use middle::trans::type_::Type;
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use middle::trans::type_of::*;
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use middle::ty;
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use util::ppaux::ty_to_str;
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use std::rc::Rc;
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use arena::TypedArena;
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use libc::c_uint;
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use syntax::ast::DefId;
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use syntax::ast;
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use syntax::ast_map;
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use syntax::parse::token::{InternedString, special_idents};
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use syntax::parse::token;
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pub struct Reflector<'a, 'b> {
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visitor_val: ValueRef,
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visitor_methods: &'a [Rc<ty::Method>],
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final_bcx: &'b Block<'b>,
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tydesc_ty: Type,
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bcx: &'b Block<'b>
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}
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impl<'a, 'b> Reflector<'a, 'b> {
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pub fn c_uint(&mut self, u: uint) -> ValueRef {
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C_uint(self.bcx.ccx(), u)
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}
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pub fn c_bool(&mut self, b: bool) -> ValueRef {
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C_bool(self.bcx.ccx(), b)
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}
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pub fn c_slice(&mut self, s: InternedString) -> ValueRef {
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// We're careful to not use first class aggregates here because that
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// will kick us off fast isel. (Issue #4352.)
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let bcx = self.bcx;
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let str_ty = ty::mk_str_slice(bcx.tcx(), ty::ReStatic, ast::MutImmutable);
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let scratch = rvalue_scratch_datum(bcx, str_ty, "");
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let len = C_uint(bcx.ccx(), s.get().len());
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let c_str = PointerCast(bcx, C_cstr(bcx.ccx(), s, false), Type::i8p(bcx.ccx()));
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Store(bcx, c_str, GEPi(bcx, scratch.val, [ 0, 0 ]));
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Store(bcx, len, GEPi(bcx, scratch.val, [ 0, 1 ]));
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scratch.val
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}
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pub fn c_size_and_align(&mut self, t: ty::t) -> Vec<ValueRef> {
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let tr = type_of(self.bcx.ccx(), t);
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let s = machine::llsize_of_real(self.bcx.ccx(), tr);
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let a = machine::llalign_of_min(self.bcx.ccx(), tr);
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return vec!(self.c_uint(s as uint),
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self.c_uint(a as uint));
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}
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pub fn c_tydesc(&mut self, t: ty::t) -> ValueRef {
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let bcx = self.bcx;
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let static_ti = get_tydesc(bcx.ccx(), t);
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glue::lazily_emit_visit_glue(bcx.ccx(), &*static_ti);
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PointerCast(bcx, static_ti.tydesc, self.tydesc_ty.ptr_to())
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}
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pub fn c_mt(&mut self, mt: &ty::mt) -> Vec<ValueRef> {
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vec!(self.c_uint(mt.mutbl as uint),
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self.c_tydesc(mt.ty))
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}
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pub fn visit(&mut self, ty_name: &str, args: &[ValueRef]) {
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let fcx = self.bcx.fcx;
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let tcx = self.bcx.tcx();
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let mth_idx = ty::method_idx(token::str_to_ident("visit_".to_owned() + ty_name),
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self.visitor_methods.as_slice()).expect(
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format!("couldn't find visit method for {}", ty_name));
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let mth_ty =
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ty::mk_bare_fn(tcx,
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self.visitor_methods[mth_idx].fty.clone());
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let v = self.visitor_val;
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debug!("passing {} args:", args.len());
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let mut bcx = self.bcx;
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for (i, a) in args.iter().enumerate() {
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debug!("arg {}: {}", i, bcx.val_to_str(*a));
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}
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let result = unpack_result!(bcx, callee::trans_call_inner(
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self.bcx, None, mth_ty,
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|bcx, _| meth::trans_trait_callee_from_llval(bcx,
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mth_ty,
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mth_idx,
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v),
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ArgVals(args), None));
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let result = bool_to_i1(bcx, result);
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let next_bcx = fcx.new_temp_block("next");
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CondBr(bcx, result, next_bcx.llbb, self.final_bcx.llbb);
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self.bcx = next_bcx
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}
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pub fn bracketed(&mut self,
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bracket_name: &str,
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extra: &[ValueRef],
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inner: |&mut Reflector|) {
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self.visit("enter_" + bracket_name, extra);
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inner(self);
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self.visit("leave_" + bracket_name, extra);
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}
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pub fn leaf(&mut self, name: &str) {
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self.visit(name, []);
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}
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// Entrypoint
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pub fn visit_ty(&mut self, t: ty::t) {
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let bcx = self.bcx;
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let tcx = bcx.tcx();
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debug!("reflect::visit_ty {}", ty_to_str(bcx.tcx(), t));
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match ty::get(t).sty {
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ty::ty_bot => self.leaf("bot"),
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ty::ty_nil => self.leaf("nil"),
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ty::ty_bool => self.leaf("bool"),
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ty::ty_char => self.leaf("char"),
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ty::ty_int(ast::TyI) => self.leaf("int"),
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ty::ty_int(ast::TyI8) => self.leaf("i8"),
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ty::ty_int(ast::TyI16) => self.leaf("i16"),
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ty::ty_int(ast::TyI32) => self.leaf("i32"),
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ty::ty_int(ast::TyI64) => self.leaf("i64"),
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ty::ty_uint(ast::TyU) => self.leaf("uint"),
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ty::ty_uint(ast::TyU8) => self.leaf("u8"),
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ty::ty_uint(ast::TyU16) => self.leaf("u16"),
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ty::ty_uint(ast::TyU32) => self.leaf("u32"),
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ty::ty_uint(ast::TyU64) => self.leaf("u64"),
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ty::ty_float(ast::TyF32) => self.leaf("f32"),
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ty::ty_float(ast::TyF64) => self.leaf("f64"),
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ty::ty_float(ast::TyF128) => self.leaf("f128"),
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// Should rename to vec_*.
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ty::ty_vec(ref mt, Some(sz)) => {
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let extra = (vec!(self.c_uint(sz))).append(self.c_size_and_align(t).as_slice());
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let extra = extra.append(self.c_mt(mt).as_slice());
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self.visit("evec_fixed".to_owned(), extra.as_slice())
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}
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ty::ty_vec(..) | ty::ty_str => fail!("unexpected unsized type"),
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// Should remove mt from box and uniq.
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ty::ty_box(typ) => {
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let extra = self.c_mt(&ty::mt {
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ty: typ,
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mutbl: ast::MutImmutable,
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});
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self.visit("box", extra.as_slice())
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}
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ty::ty_uniq(typ) => {
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match ty::get(typ).sty {
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ty::ty_vec(ref mt, None) => {
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let extra = Vec::new();
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let extra = extra.append(self.c_mt(mt).as_slice());
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self.visit("evec_uniq".to_owned(), extra.as_slice())
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}
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ty::ty_str => self.visit("estr_uniq".to_owned(), &[]),
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_ => {
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let extra = self.c_mt(&ty::mt {
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ty: typ,
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mutbl: ast::MutImmutable,
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});
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self.visit("uniq", extra.as_slice())
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}
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}
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}
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ty::ty_ptr(ref mt) => {
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let extra = self.c_mt(mt);
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self.visit("ptr", extra.as_slice())
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}
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ty::ty_rptr(_, ref mt) => {
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match ty::get(mt.ty).sty {
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ty::ty_vec(ref mt, None) => {
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let (name, extra) = ("slice".to_owned(), Vec::new());
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let extra = extra.append(self.c_mt(mt).as_slice());
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self.visit("evec_".to_owned() + name, extra.as_slice())
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}
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ty::ty_str => self.visit("estr_slice".to_owned(), &[]),
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_ => {
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let extra = self.c_mt(mt);
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self.visit("rptr", extra.as_slice())
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}
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}
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}
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ty::ty_tup(ref tys) => {
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let extra = (vec!(self.c_uint(tys.len())))
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.append(self.c_size_and_align(t).as_slice());
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self.bracketed("tup", extra.as_slice(), |this| {
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for (i, t) in tys.iter().enumerate() {
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let extra = vec!(this.c_uint(i), this.c_tydesc(*t));
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this.visit("tup_field", extra.as_slice());
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}
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})
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}
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// FIXME (#2594): fetch constants out of intrinsic
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// FIXME (#4809): visitor should break out bare fns from other fns
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ty::ty_closure(ref fty) => {
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let pureval = ast_fn_style_constant(fty.fn_style);
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let sigilval = match fty.store {
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ty::UniqTraitStore => 2u,
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ty::RegionTraitStore(..) => 4u,
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};
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let retval = if ty::type_is_bot(fty.sig.output) {0u} else {1u};
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let extra = vec!(self.c_uint(pureval),
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self.c_uint(sigilval),
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self.c_uint(fty.sig.inputs.len()),
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self.c_uint(retval));
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self.visit("enter_fn", extra.as_slice());
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self.visit_sig(retval, &fty.sig);
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self.visit("leave_fn", extra.as_slice());
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}
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// FIXME (#2594): fetch constants out of intrinsic:: for the
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// numbers.
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ty::ty_bare_fn(ref fty) => {
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let pureval = ast_fn_style_constant(fty.fn_style);
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let sigilval = 0u;
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let retval = if ty::type_is_bot(fty.sig.output) {0u} else {1u};
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let extra = vec!(self.c_uint(pureval),
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self.c_uint(sigilval),
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self.c_uint(fty.sig.inputs.len()),
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self.c_uint(retval));
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self.visit("enter_fn", extra.as_slice());
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self.visit_sig(retval, &fty.sig);
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self.visit("leave_fn", extra.as_slice());
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}
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ty::ty_struct(did, ref substs) => {
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let fields = ty::struct_fields(tcx, did, substs);
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let mut named_fields = false;
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if !fields.is_empty() {
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named_fields = fields.get(0).ident.name !=
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special_idents::unnamed_field.name;
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}
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let extra = (vec!(
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self.c_slice(token::intern_and_get_ident(ty_to_str(tcx,
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t))),
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self.c_bool(named_fields),
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self.c_uint(fields.len())
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)).append(self.c_size_and_align(t).as_slice());
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self.bracketed("class", extra.as_slice(), |this| {
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for (i, field) in fields.iter().enumerate() {
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let extra = (vec!(
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this.c_uint(i),
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this.c_slice(token::get_ident(field.ident)),
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this.c_bool(named_fields)
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)).append(this.c_mt(&field.mt).as_slice());
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this.visit("class_field", extra.as_slice());
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}
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})
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}
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// FIXME (#2595): visiting all the variants in turn is probably
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// not ideal. It'll work but will get costly on big enums. Maybe
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// let the visitor tell us if it wants to visit only a particular
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// variant?
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ty::ty_enum(did, ref substs) => {
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let ccx = bcx.ccx();
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let repr = adt::represent_type(bcx.ccx(), t);
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let variants = ty::substd_enum_variants(ccx.tcx(), did, substs);
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let llptrty = type_of(ccx, t).ptr_to();
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let opaquety = ty::get_opaque_ty(ccx.tcx()).unwrap();
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let opaqueptrty = ty::mk_ptr(ccx.tcx(), ty::mt { ty: opaquety,
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mutbl: ast::MutImmutable });
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let make_get_disr = || {
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let sym = mangle_internal_name_by_path_and_seq(
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ast_map::Values([].iter()).chain(None), "get_disr");
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let llfdecl = decl_internal_rust_fn(ccx, false, [opaqueptrty], ty::mk_u64(), sym);
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let arena = TypedArena::new();
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let fcx = new_fn_ctxt(ccx, llfdecl, -1, false,
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ty::mk_u64(), None, None, &arena);
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init_function(&fcx, false, ty::mk_u64());
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let arg = unsafe {
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//
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// we know the return type of llfdecl is an int here, so
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// no need for a special check to see if the return type
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// is immediate.
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//
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llvm::LLVMGetParam(llfdecl, fcx.arg_pos(0u) as c_uint)
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};
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let bcx = fcx.entry_bcx.borrow().clone().unwrap();
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let arg = BitCast(bcx, arg, llptrty);
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let ret = adt::trans_get_discr(bcx, &*repr, arg, Some(Type::i64(ccx)));
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Store(bcx, ret, fcx.llretptr.get().unwrap());
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match fcx.llreturn.get() {
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Some(llreturn) => Br(bcx, llreturn),
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None => {}
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};
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finish_fn(&fcx, bcx);
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llfdecl
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};
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let enum_args = (vec!(self.c_uint(variants.len()), make_get_disr()))
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.append(self.c_size_and_align(t).as_slice());
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self.bracketed("enum", enum_args.as_slice(), |this| {
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for (i, v) in variants.iter().enumerate() {
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let name = token::get_ident(v.name);
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let variant_args = [this.c_uint(i),
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C_u64(ccx, v.disr_val),
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this.c_uint(v.args.len()),
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this.c_slice(name)];
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this.bracketed("enum_variant",
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variant_args,
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|this| {
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for (j, a) in v.args.iter().enumerate() {
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let bcx = this.bcx;
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let null = C_null(llptrty);
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let ptr = adt::trans_field_ptr(bcx, &*repr, null, v.disr_val, j);
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let offset = p2i(ccx, ptr);
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let field_args = [this.c_uint(j),
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offset,
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this.c_tydesc(*a)];
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this.visit("enum_variant_field",
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field_args);
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}
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})
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}
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})
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}
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ty::ty_trait(..) => {
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let extra = [
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self.c_slice(token::intern_and_get_ident(ty_to_str(tcx, t)))
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];
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self.visit("trait", extra);
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}
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// Miscellaneous extra types
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ty::ty_infer(_) => self.leaf("infer"),
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ty::ty_err => self.leaf("err"),
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ty::ty_param(ref p) => {
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let extra = vec!(self.c_uint(p.idx));
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self.visit("param", extra.as_slice())
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}
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ty::ty_self(..) => self.leaf("self")
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}
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}
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pub fn visit_sig(&mut self, retval: uint, sig: &ty::FnSig) {
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for (i, arg) in sig.inputs.iter().enumerate() {
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let modeval = 5u; // "by copy"
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let extra = vec!(self.c_uint(i),
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self.c_uint(modeval),
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self.c_tydesc(*arg));
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self.visit("fn_input", extra.as_slice());
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}
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let extra = vec!(self.c_uint(retval),
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self.c_bool(sig.variadic),
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self.c_tydesc(sig.output));
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self.visit("fn_output", extra.as_slice());
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}
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}
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// Emit a sequence of calls to visit_ty::visit_foo
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pub fn emit_calls_to_trait_visit_ty<'a>(
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bcx: &'a Block<'a>,
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t: ty::t,
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visitor_val: ValueRef,
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visitor_trait_id: DefId)
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-> &'a Block<'a> {
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let fcx = bcx.fcx;
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let final = fcx.new_temp_block("final");
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let tydesc_ty = ty::get_tydesc_ty(bcx.tcx()).unwrap();
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let tydesc_ty = type_of(bcx.ccx(), tydesc_ty);
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let visitor_methods = ty::trait_methods(bcx.tcx(), visitor_trait_id);
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let mut r = Reflector {
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visitor_val: visitor_val,
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visitor_methods: visitor_methods.as_slice(),
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final_bcx: final,
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tydesc_ty: tydesc_ty,
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bcx: bcx
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};
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r.visit_ty(t);
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Br(r.bcx, final.llbb);
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return final;
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}
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pub fn ast_fn_style_constant(fn_style: ast::FnStyle) -> uint {
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match fn_style {
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ast::UnsafeFn => 1u,
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ast::NormalFn => 2u,
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}
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}
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