147 lines
3.5 KiB
C
147 lines
3.5 KiB
C
/* Convert language-specific tree expression to rtl instructions,
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for GNU compiler.
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Copyright (C) 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998,
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2000, 2001 Free Software Foundation, Inc.
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This file is part of GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "rtl.h"
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#include "tree.h"
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#include "flags.h"
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#include "expr.h"
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#include "cp-tree.h"
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#include "toplev.h"
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#include "except.h"
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#include "tm_p.h"
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static rtx cplus_expand_expr PARAMS ((tree, rtx, enum machine_mode,
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enum expand_modifier));
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/* Hook used by output_constant to expand language-specific
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constants. */
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tree
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cplus_expand_constant (cst)
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tree cst;
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{
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switch (TREE_CODE (cst))
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{
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case PTRMEM_CST:
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{
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tree type = TREE_TYPE (cst);
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tree member;
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/* Find the member. */
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member = PTRMEM_CST_MEMBER (cst);
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if (TREE_CODE (member) == FIELD_DECL)
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{
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/* Find the offset for the field. */
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tree offset = byte_position (member);
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cst = fold (build1 (NOP_EXPR, type, offset));
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}
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else
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{
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tree delta;
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tree pfn;
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expand_ptrmemfunc_cst (cst, &delta, &pfn);
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cst = build_ptrmemfunc1 (type, delta, pfn);
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}
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}
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break;
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default:
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/* There's nothing to do. */
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break;
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}
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return cst;
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}
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/* Hook used by expand_expr to expand language-specific tree codes. */
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static rtx
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cplus_expand_expr (exp, target, tmode, modifier)
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tree exp;
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rtx target;
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enum machine_mode tmode;
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enum expand_modifier modifier;
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{
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tree type = TREE_TYPE (exp);
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register enum machine_mode mode = TYPE_MODE (type);
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register enum tree_code code = TREE_CODE (exp);
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rtx ret;
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/* No sense saving up arithmetic to be done
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if it's all in the wrong mode to form part of an address.
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And force_operand won't know whether to sign-extend or zero-extend. */
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if (mode != Pmode && modifier == EXPAND_SUM)
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modifier = EXPAND_NORMAL;
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switch (code)
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{
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case PTRMEM_CST:
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return expand_expr (cplus_expand_constant (exp),
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target, tmode, modifier);
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case OFFSET_REF:
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/* Offset refs should not make it through to here. */
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abort ();
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return const0_rtx;
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case THROW_EXPR:
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expand_expr (TREE_OPERAND (exp, 0), const0_rtx, VOIDmode, 0);
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return NULL;
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case MUST_NOT_THROW_EXPR:
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expand_eh_region_start ();
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ret = expand_expr (TREE_OPERAND (exp, 0), target, tmode, modifier);
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expand_eh_region_end_must_not_throw (build_call (terminate_node, 0));
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return ret;
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case EMPTY_CLASS_EXPR:
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/* We don't need to generate any code for an empty class. */
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return const0_rtx;
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default:
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return c_expand_expr (exp, target, tmode, modifier);
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}
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abort ();
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/* NOTREACHED */
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return NULL;
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}
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void
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init_cplus_expand ()
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{
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lang_expand_expr = cplus_expand_expr;
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}
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int
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extract_init (decl, init)
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tree decl ATTRIBUTE_UNUSED, init ATTRIBUTE_UNUSED;
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{
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return 0;
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}
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