558 lines
22 KiB
Rust
558 lines
22 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::abi;
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use lib::llvm::{llvm, SetLinkage, PrivateLinkage,
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ValueRef, TypeRef, Bool, True, False};
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use metadata::csearch;
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use middle::const_eval;
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use middle::trans::adt;
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use middle::trans::base;
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use middle::trans::base::get_insn_ctxt;
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use middle::trans::common::*;
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use middle::trans::consts;
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use middle::trans::expr;
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use middle::trans::inline;
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use middle::trans::machine;
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use middle::trans::type_of;
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use middle::ty;
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use util::ppaux::{Repr, ty_to_str};
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use core::libc::c_uint;
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use syntax::{ast, ast_util, ast_map};
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use util::ppaux::ty_to_str;
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pub fn const_lit(cx: @CrateContext, e: @ast::expr, lit: ast::lit)
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-> ValueRef {
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let _icx = cx.insn_ctxt("trans_lit");
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match lit.node {
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ast::lit_int(i, t) => C_integral(T_int_ty(cx, t), i as u64, True),
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ast::lit_uint(u, t) => C_integral(T_uint_ty(cx, t), u, False),
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ast::lit_int_unsuffixed(i) => {
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let lit_int_ty = ty::node_id_to_type(cx.tcx, e.id);
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match ty::get(lit_int_ty).sty {
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ty::ty_int(t) => {
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C_integral(T_int_ty(cx, t), i as u64, True)
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}
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ty::ty_uint(t) => {
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C_integral(T_uint_ty(cx, t), i as u64, False)
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}
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_ => cx.sess.span_bug(lit.span,
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fmt!("integer literal has type %s (expected int or uint)",
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ty_to_str(cx.tcx, lit_int_ty)))
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}
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}
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ast::lit_float(fs, t) => C_floating(/*bad*/copy *fs, T_float_ty(cx, t)),
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ast::lit_float_unsuffixed(fs) => {
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let lit_float_ty = ty::node_id_to_type(cx.tcx, e.id);
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match ty::get(lit_float_ty).sty {
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ty::ty_float(t) => {
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C_floating(/*bad*/copy *fs, T_float_ty(cx, t))
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}
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_ => {
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cx.sess.span_bug(lit.span,
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"floating point literal doesn't have the right type");
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}
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}
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}
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ast::lit_bool(b) => C_bool(b),
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ast::lit_nil => C_nil(),
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ast::lit_str(s) => C_estr_slice(cx, s)
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}
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}
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pub fn const_ptrcast(cx: @CrateContext, a: ValueRef, t: TypeRef) -> ValueRef {
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unsafe {
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let b = llvm::LLVMConstPointerCast(a, T_ptr(t));
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assert!(cx.const_globals.insert(b as int, a));
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b
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}
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}
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pub fn const_vec(cx: @CrateContext, e: @ast::expr, es: &[@ast::expr])
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-> (ValueRef, ValueRef, TypeRef) {
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unsafe {
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let vec_ty = ty::expr_ty(cx.tcx, e);
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let unit_ty = ty::sequence_element_type(cx.tcx, vec_ty);
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let llunitty = type_of::type_of(cx, unit_ty);
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let unit_sz = machine::llsize_of(cx, llunitty);
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let sz = llvm::LLVMConstMul(C_uint(cx, es.len()), unit_sz);
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let vs = es.map(|e| const_expr(cx, *e));
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// If the vector contains enums, an LLVM array won't work.
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let v = if vs.any(|vi| val_ty(*vi) != llunitty) {
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C_struct(vs)
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} else {
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C_array(llunitty, vs)
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};
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return (v, sz, llunitty);
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}
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}
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fn const_addr_of(cx: @CrateContext, cv: ValueRef) -> ValueRef {
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unsafe {
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let gv = do str::as_c_str("const") |name| {
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llvm::LLVMAddGlobal(cx.llmod, val_ty(cv), name)
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};
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llvm::LLVMSetInitializer(gv, cv);
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llvm::LLVMSetGlobalConstant(gv, True);
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SetLinkage(gv, PrivateLinkage);
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gv
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}
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}
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fn const_deref_ptr(cx: @CrateContext, v: ValueRef) -> ValueRef {
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let v = match cx.const_globals.find(&(v as int)) {
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Some(&v) => v,
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None => v
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};
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unsafe {
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assert!(llvm::LLVMIsGlobalConstant(v) == True);
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llvm::LLVMGetInitializer(v)
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}
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}
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fn const_deref_newtype(cx: @CrateContext, v: ValueRef, t: ty::t)
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-> ValueRef {
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let repr = adt::represent_type(cx, t);
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adt::const_get_field(cx, repr, v, 0, 0)
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}
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fn const_deref(cx: @CrateContext, v: ValueRef, t: ty::t, explicit: bool)
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-> (ValueRef, ty::t) {
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match ty::deref(cx.tcx, t, explicit) {
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Some(ref mt) => {
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assert!(mt.mutbl != ast::m_mutbl);
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let dv = match ty::get(t).sty {
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ty::ty_ptr(*) | ty::ty_rptr(*) => {
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const_deref_ptr(cx, v)
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}
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ty::ty_enum(*) | ty::ty_struct(*) => {
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const_deref_newtype(cx, v, t)
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}
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_ => {
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cx.sess.bug(fmt!("Unexpected dereferenceable type %s",
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ty_to_str(cx.tcx, t)))
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}
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};
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(dv, mt.ty)
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}
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None => {
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cx.sess.bug(fmt!("Can't dereference const of type %s",
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ty_to_str(cx.tcx, t)))
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}
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}
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}
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pub fn get_const_val(cx: @CrateContext, def_id: ast::def_id) -> ValueRef {
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let mut def_id = def_id;
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if !ast_util::is_local(def_id) ||
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!cx.const_values.contains_key(&def_id.node) {
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if !ast_util::is_local(def_id) {
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def_id = inline::maybe_instantiate_inline(cx, def_id, true);
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}
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match *cx.tcx.items.get(&def_id.node) {
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ast_map::node_item(@ast::item {
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node: ast::item_const(_, subexpr), _
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}, _) => {
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trans_const(cx, subexpr, def_id.node);
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}
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_ => cx.tcx.sess.bug(~"expected a const to be an item")
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}
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}
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*cx.const_values.get(&def_id.node)
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}
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pub fn const_expr(cx: @CrateContext, e: @ast::expr) -> ValueRef {
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let mut llconst = const_expr_unadjusted(cx, e);
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let ety = ty::expr_ty(cx.tcx, e);
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match cx.tcx.adjustments.find(&e.id) {
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None => { }
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Some(&@ty::AutoAddEnv(ty::re_static, ast::BorrowedSigil)) => {
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llconst = C_struct(~[llconst, C_null(T_opaque_box_ptr(cx))])
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}
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Some(&@ty::AutoAddEnv(ref r, ref s)) => {
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cx.sess.span_bug(e.span, fmt!("unexpected static function: \
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region %? sigil %?", *r, *s))
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}
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Some(&@ty::AutoDerefRef(ref adj)) => {
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let mut ty = ety;
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let mut maybe_ptr = None;
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for adj.autoderefs.times {
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let (dv, dt) = const_deref(cx, llconst, ty, false);
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maybe_ptr = Some(llconst);
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llconst = dv;
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ty = dt;
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}
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match adj.autoref {
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None => { }
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Some(ref autoref) => {
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assert!(autoref.region == ty::re_static);
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assert!(autoref.mutbl != ast::m_mutbl);
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// Don't copy data to do a deref+ref.
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let llptr = match maybe_ptr {
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Some(ptr) => ptr,
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None => const_addr_of(cx, llconst)
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};
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match autoref.kind {
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ty::AutoPtr => {
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llconst = llptr;
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}
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ty::AutoBorrowVec => {
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let size = machine::llsize_of(cx,
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val_ty(llconst));
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assert!(abi::slice_elt_base == 0);
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assert!(abi::slice_elt_len == 1);
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llconst = C_struct(~[llptr, size]);
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}
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_ => {
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cx.sess.span_bug(e.span,
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fmt!("unimplemented const \
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autoref %?", autoref))
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}
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}
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}
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}
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}
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}
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let ety_adjusted = ty::expr_ty_adjusted(cx.tcx, e);
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let llty = type_of::sizing_type_of(cx, ety_adjusted);
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let csize = machine::llsize_of_alloc(cx, val_ty(llconst));
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let tsize = machine::llsize_of_alloc(cx, llty);
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if csize != tsize {
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unsafe {
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// XXX these values could use some context
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llvm::LLVMDumpValue(llconst);
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llvm::LLVMDumpValue(C_undef(llty));
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}
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cx.sess.bug(fmt!("const %s of type %s has size %u instead of %u",
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e.repr(cx.tcx), ty_to_str(cx.tcx, ety),
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csize, tsize));
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}
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llconst
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}
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fn const_expr_unadjusted(cx: @CrateContext, e: @ast::expr) -> ValueRef {
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unsafe {
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let _icx = cx.insn_ctxt("const_expr");
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return match e.node {
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ast::expr_lit(lit) => consts::const_lit(cx, e, *lit),
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ast::expr_binary(b, e1, e2) => {
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let te1 = const_expr(cx, e1);
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let te2 = const_expr(cx, e2);
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let te2 = base::cast_shift_const_rhs(b, te1, te2);
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/* Neither type is bottom, and we expect them to be unified
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* already, so the following is safe. */
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let ty = ty::expr_ty(cx.tcx, e1);
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let is_float = ty::type_is_fp(ty);
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let signed = ty::type_is_signed(ty);
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return match b {
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ast::add => {
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if is_float { llvm::LLVMConstFAdd(te1, te2) }
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else { llvm::LLVMConstAdd(te1, te2) }
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}
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ast::subtract => {
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if is_float { llvm::LLVMConstFSub(te1, te2) }
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else { llvm::LLVMConstSub(te1, te2) }
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}
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ast::mul => {
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if is_float { llvm::LLVMConstFMul(te1, te2) }
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else { llvm::LLVMConstMul(te1, te2) }
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}
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ast::div => {
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if is_float { llvm::LLVMConstFDiv(te1, te2) }
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else if signed { llvm::LLVMConstSDiv(te1, te2) }
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else { llvm::LLVMConstUDiv(te1, te2) }
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}
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ast::rem => {
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if is_float { llvm::LLVMConstFRem(te1, te2) }
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else if signed { llvm::LLVMConstSRem(te1, te2) }
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else { llvm::LLVMConstURem(te1, te2) }
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}
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ast::and |
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ast::or => cx.sess.span_unimpl(e.span, "binop logic"),
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ast::bitxor => llvm::LLVMConstXor(te1, te2),
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ast::bitand => llvm::LLVMConstAnd(te1, te2),
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ast::bitor => llvm::LLVMConstOr(te1, te2),
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ast::shl => llvm::LLVMConstShl(te1, te2),
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ast::shr => {
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if signed { llvm::LLVMConstAShr(te1, te2) }
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else { llvm::LLVMConstLShr(te1, te2) }
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}
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ast::eq |
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ast::lt |
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ast::le |
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ast::ne |
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ast::ge |
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ast::gt => cx.sess.span_unimpl(e.span, "binop comparator")
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}
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}
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ast::expr_unary(u, e) => {
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let te = const_expr(cx, e);
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let ty = ty::expr_ty(cx.tcx, e);
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let is_float = ty::type_is_fp(ty);
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return match u {
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ast::box(_) |
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ast::uniq(_) |
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ast::deref => {
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let (dv, _dt) = const_deref(cx, te, ty, true);
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dv
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}
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ast::not => {
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match ty::get(ty).sty {
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ty::ty_bool => {
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// Somewhat questionable, but I believe this is
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// correct.
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let te = llvm::LLVMConstTrunc(te, T_i1());
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let te = llvm::LLVMConstNot(te);
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llvm::LLVMConstZExt(te, T_bool())
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}
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_ => llvm::LLVMConstNot(te),
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}
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}
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ast::neg => {
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if is_float { llvm::LLVMConstFNeg(te) }
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else { llvm::LLVMConstNeg(te) }
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}
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}
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}
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ast::expr_field(base, field, _) => {
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let bt = ty::expr_ty_adjusted(cx.tcx, base);
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let brepr = adt::represent_type(cx, bt);
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let bv = const_expr(cx, base);
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do expr::with_field_tys(cx.tcx, bt, None) |discr, field_tys| {
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let ix = ty::field_idx_strict(cx.tcx, field, field_tys);
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adt::const_get_field(cx, brepr, bv, discr, ix)
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}
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}
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ast::expr_index(base, index) => {
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let bt = ty::expr_ty_adjusted(cx.tcx, base);
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let bv = const_expr(cx, base);
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let iv = match const_eval::eval_const_expr(cx.tcx, index) {
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const_eval::const_int(i) => i as u64,
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const_eval::const_uint(u) => u,
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_ => cx.sess.span_bug(index.span,
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"index is not an integer-constant expression")
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};
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let (arr, len) = match ty::get(bt).sty {
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ty::ty_evec(_, vstore) | ty::ty_estr(vstore) =>
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match vstore {
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ty::vstore_fixed(u) =>
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(bv, C_uint(cx, u)),
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ty::vstore_slice(_) => {
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let unit_ty = ty::sequence_element_type(cx.tcx, bt);
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let llunitty = type_of::type_of(cx, unit_ty);
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let unit_sz = machine::llsize_of(cx, llunitty);
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(const_deref_ptr(cx, const_get_elt(cx, bv, [0])),
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llvm::LLVMConstUDiv(const_get_elt(cx, bv, [1]),
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unit_sz))
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},
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_ => cx.sess.span_bug(base.span,
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"index-expr base must be fixed-size or slice")
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},
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_ => cx.sess.span_bug(base.span,
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"index-expr base must be a vector or string type")
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};
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let len = llvm::LLVMConstIntGetZExtValue(len) as u64;
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let len = match ty::get(bt).sty {
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ty::ty_estr(*) => {assert!(len > 0); len - 1},
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_ => len
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};
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if iv >= len {
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// FIXME #3170: report this earlier on in the const-eval
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// pass. Reporting here is a bit late.
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cx.sess.span_err(e.span,
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"const index-expr is out of bounds");
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}
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const_get_elt(cx, arr, [iv as c_uint])
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}
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ast::expr_cast(base, _) => {
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let ety = ty::expr_ty(cx.tcx, e);
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let llty = type_of::type_of(cx, ety);
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let basety = ty::expr_ty(cx.tcx, base);
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let v = const_expr(cx, base);
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match (expr::cast_type_kind(basety),
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expr::cast_type_kind(ety)) {
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(expr::cast_integral, expr::cast_integral) => {
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let s = ty::type_is_signed(basety) as Bool;
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llvm::LLVMConstIntCast(v, llty, s)
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}
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(expr::cast_integral, expr::cast_float) => {
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if ty::type_is_signed(basety) {
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llvm::LLVMConstSIToFP(v, llty)
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} else {
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llvm::LLVMConstUIToFP(v, llty)
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}
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}
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(expr::cast_float, expr::cast_float) => {
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llvm::LLVMConstFPCast(v, llty)
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}
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(expr::cast_float, expr::cast_integral) => {
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if ty::type_is_signed(ety) { llvm::LLVMConstFPToSI(v, llty) }
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else { llvm::LLVMConstFPToUI(v, llty) }
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}
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(expr::cast_enum, expr::cast_integral) |
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(expr::cast_enum, expr::cast_float) => {
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let repr = adt::represent_type(cx, basety);
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let iv = C_int(cx, adt::const_get_discrim(cx, repr, v));
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let ety_cast = expr::cast_type_kind(ety);
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match ety_cast {
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expr::cast_integral => {
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let s = ty::type_is_signed(ety) as Bool;
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llvm::LLVMConstIntCast(iv, llty, s)
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}
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expr::cast_float => llvm::LLVMConstUIToFP(iv, llty),
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_ => cx.sess.bug(~"enum cast destination is not \
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integral or float")
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}
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}
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(expr::cast_pointer, expr::cast_pointer) => {
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llvm::LLVMConstPointerCast(v, llty)
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}
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(expr::cast_integral, expr::cast_pointer) => {
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llvm::LLVMConstIntToPtr(v, llty)
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}
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_ => {
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cx.sess.impossible_case(e.span,
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~"bad combination of types for cast")
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}
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}
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}
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ast::expr_addr_of(ast::m_imm, sub) => {
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const_addr_of(cx, const_expr(cx, sub))
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}
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ast::expr_tup(ref es) => {
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let ety = ty::expr_ty(cx.tcx, e);
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let repr = adt::represent_type(cx, ety);
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adt::trans_const(cx, repr, 0, es.map(|e| const_expr(cx, *e)))
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}
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ast::expr_struct(_, ref fs, None) => {
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|
let ety = ty::expr_ty(cx.tcx, e);
|
|
let repr = adt::represent_type(cx, ety);
|
|
do expr::with_field_tys(cx.tcx, ety, Some(e.id))
|
|
|discr, field_tys| {
|
|
let cs = field_tys.map(|field_ty| {
|
|
match fs.find(|f| field_ty.ident == f.node.ident) {
|
|
Some(ref f) => const_expr(cx, (*f).node.expr),
|
|
None => {
|
|
cx.tcx.sess.span_bug(e.span, "missing struct field");
|
|
}
|
|
}
|
|
});
|
|
adt::trans_const(cx, repr, discr, cs)
|
|
}
|
|
}
|
|
ast::expr_vec(ref es, ast::m_imm) => {
|
|
let (v, _, _) = const_vec(cx, e, *es);
|
|
v
|
|
}
|
|
ast::expr_vstore(sub, ast::expr_vstore_slice) => {
|
|
match sub.node {
|
|
ast::expr_lit(ref lit) => {
|
|
match lit.node {
|
|
ast::lit_str(*) => { const_expr(cx, sub) }
|
|
_ => { cx.sess.span_bug(e.span, "bad const-slice lit") }
|
|
}
|
|
}
|
|
ast::expr_vec(ref es, ast::m_imm) => {
|
|
let (cv, sz, llunitty) = const_vec(cx, e, *es);
|
|
let llty = val_ty(cv);
|
|
let gv = do str::as_c_str("const") |name| {
|
|
llvm::LLVMAddGlobal(cx.llmod, llty, name)
|
|
};
|
|
llvm::LLVMSetInitializer(gv, cv);
|
|
llvm::LLVMSetGlobalConstant(gv, True);
|
|
SetLinkage(gv, PrivateLinkage);
|
|
let p = const_ptrcast(cx, gv, llunitty);
|
|
C_struct(~[p, sz])
|
|
}
|
|
_ => cx.sess.span_bug(e.span, "bad const-slice expr")
|
|
}
|
|
}
|
|
ast::expr_path(pth) => {
|
|
assert!(pth.types.len() == 0);
|
|
match cx.tcx.def_map.find(&e.id) {
|
|
Some(&ast::def_fn(def_id, _purity)) => {
|
|
if !ast_util::is_local(def_id) {
|
|
let ty = csearch::get_type(cx.tcx, def_id).ty;
|
|
base::trans_external_path(cx, def_id, ty)
|
|
} else {
|
|
assert!(ast_util::is_local(def_id));
|
|
base::get_item_val(cx, def_id.node)
|
|
}
|
|
}
|
|
Some(&ast::def_const(def_id)) => {
|
|
get_const_val(cx, def_id)
|
|
}
|
|
Some(&ast::def_variant(enum_did, variant_did)) => {
|
|
let ety = ty::expr_ty(cx.tcx, e);
|
|
let repr = adt::represent_type(cx, ety);
|
|
let vinfo = ty::enum_variant_with_id(cx.tcx,
|
|
enum_did,
|
|
variant_did);
|
|
adt::trans_const(cx, repr, vinfo.disr_val, [])
|
|
}
|
|
Some(&ast::def_struct(_)) => {
|
|
let ety = ty::expr_ty(cx.tcx, e);
|
|
let llty = type_of::type_of(cx, ety);
|
|
C_null(llty)
|
|
}
|
|
_ => {
|
|
cx.sess.span_bug(e.span, "expected a const, fn, struct, or variant def")
|
|
}
|
|
}
|
|
}
|
|
ast::expr_call(callee, ref args, _) => {
|
|
match cx.tcx.def_map.find(&callee.id) {
|
|
Some(&ast::def_struct(_)) => {
|
|
let ety = ty::expr_ty(cx.tcx, e);
|
|
let repr = adt::represent_type(cx, ety);
|
|
adt::trans_const(cx, repr, 0,
|
|
args.map(|a| const_expr(cx, *a)))
|
|
}
|
|
Some(&ast::def_variant(enum_did, variant_did)) => {
|
|
let ety = ty::expr_ty(cx.tcx, e);
|
|
let repr = adt::represent_type(cx, ety);
|
|
let vinfo = ty::enum_variant_with_id(cx.tcx,
|
|
enum_did,
|
|
variant_did);
|
|
adt::trans_const(cx, repr, vinfo.disr_val,
|
|
args.map(|a| const_expr(cx, *a)))
|
|
}
|
|
_ => cx.sess.span_bug(e.span, "expected a struct or variant def")
|
|
}
|
|
}
|
|
ast::expr_paren(e) => { return const_expr(cx, e); }
|
|
_ => cx.sess.span_bug(e.span,
|
|
"bad constant expression type in consts::const_expr")
|
|
};
|
|
}
|
|
}
|
|
|
|
pub fn trans_const(ccx: @CrateContext, _e: @ast::expr, id: ast::node_id) {
|
|
unsafe {
|
|
let _icx = ccx.insn_ctxt("trans_const");
|
|
let g = base::get_item_val(ccx, id);
|
|
// At this point, get_item_val has already translated the
|
|
// constant's initializer to determine its LLVM type.
|
|
let v = *ccx.const_values.get(&id);
|
|
llvm::LLVMSetInitializer(g, v);
|
|
llvm::LLVMSetGlobalConstant(g, True);
|
|
}
|
|
}
|