797 lines
24 KiB
C
797 lines
24 KiB
C
/* Garbage collection primitives for GNU C++.
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Copyright (C) 1992, 1993 Free Software Foundation, Inc.
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Contributed by Michael Tiemann (tiemann@cygnus.com)
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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, 675 Mass Ave, Cambridge, MA 02139, USA. */
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#ifndef lint
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static char rcsid[] = "$Id: cp-gc.c,v 1.2 1993/08/02 17:31:46 mycroft Exp $";
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#endif /* not lint */
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#include "config.h"
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#include "tree.h"
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#include "cp-tree.h"
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#include "flags.h"
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#undef NULL
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#define NULL 0
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extern tree define_function ();
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extern tree build_t_desc_overload ();
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/* This is the function decl for the (pseudo-builtin) __gc_protect
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function. Args are (class *value, int index); Returns value. */
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tree gc_protect_fndecl;
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/* This is the function decl for the (pseudo-builtin) __gc_unprotect
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function. Args are (int index); void return. */
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tree gc_unprotect_fndecl;
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/* This is the function decl for the (pseudo-builtin) __gc_push
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function. Args are (int length); void return. */
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tree gc_push_fndecl;
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/* This is the function decl for the (pseudo-builtin) __gc_pop
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function. Args are void; void return. */
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tree gc_pop_fndecl;
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/* Special integers that are used to represent bits in gc-safe objects. */
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tree gc_nonobject;
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tree gc_visible;
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tree gc_white;
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tree gc_offwhite;
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tree gc_grey;
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tree gc_black;
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/* in c-common.c */
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extern tree combine_strings PROTO((tree));
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/* Predicate that returns non-zero if TYPE needs some kind of
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entry for the GC. Returns zero otherwise. */
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int
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type_needs_gc_entry (type)
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tree type;
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{
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tree ttype = type;
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if (! flag_gc || type == error_mark_node)
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return 0;
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/* Aggregate types need gc entries if any of their members
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need gc entries. */
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if (IS_AGGR_TYPE (type))
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{
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tree binfos;
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tree fields = TYPE_FIELDS (type);
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int i;
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/* We don't care about certain pointers. Pointers
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to virtual baseclasses are always up front. We also
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cull out virtual function table pointers because it's
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easy, and it simplifies the logic.*/
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while (fields
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&& (DECL_NAME (fields) == NULL_TREE
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|| VFIELD_NAME_P (DECL_NAME (fields))
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|| VBASE_NAME_P (DECL_NAME (fields))
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|| !strcmp (IDENTIFIER_POINTER (DECL_NAME (fields)), "__bits")))
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fields = TREE_CHAIN (fields);
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while (fields)
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{
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if (type_needs_gc_entry (TREE_TYPE (fields)))
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return 1;
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fields = TREE_CHAIN (fields);
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}
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binfos = TYPE_BINFO_BASETYPES (type);
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if (binfos)
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for (i = TREE_VEC_LENGTH (binfos)-1; i >= 0; i--)
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if (type_needs_gc_entry (BINFO_TYPE (TREE_VEC_ELT (binfos, i))))
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return 1;
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return 0;
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}
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while (TREE_CODE (ttype) == ARRAY_TYPE
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&& TREE_CODE (TREE_TYPE (ttype)) == ARRAY_TYPE)
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ttype = TREE_TYPE (ttype);
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if ((TREE_CODE (ttype) == POINTER_TYPE
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|| TREE_CODE (ttype) == ARRAY_TYPE
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|| TREE_CODE (ttype) == REFERENCE_TYPE)
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&& IS_AGGR_TYPE (TREE_TYPE (ttype))
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&& CLASSTYPE_DOSSIER (TREE_TYPE (ttype)))
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return 1;
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return 0;
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}
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/* Predicate that returns non-zero iff FROM is safe from the GC.
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If TO is nonzero, it means we know that FROM is being stored
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in TO, which make make it safe. */
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int
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value_safe_from_gc (to, from)
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tree to, from;
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{
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/* First, return non-zero for easy cases: parameters,
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static variables. */
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if (TREE_CODE (from) == PARM_DECL
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|| (TREE_CODE (from) == VAR_DECL
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&& TREE_STATIC (from)))
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return 1;
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/* If something has its address taken, it cannot be
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in the heap, so it doesn't need to be protected. */
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if (TREE_CODE (from) == ADDR_EXPR || TREE_REFERENCE_EXPR (from))
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return 1;
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/* If we are storing into a static variable, then what
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we store will be safe from the gc. */
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if (to && TREE_CODE (to) == VAR_DECL
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&& TREE_STATIC (to))
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return 1;
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/* Now recurse on structure of FROM. */
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switch (TREE_CODE (from))
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{
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case COMPONENT_REF:
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/* These guys are special, and safe. */
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if (TREE_CODE (TREE_OPERAND (from, 1)) == FIELD_DECL
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&& (VFIELD_NAME_P (DECL_NAME (TREE_OPERAND (from, 1)))
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|| VBASE_NAME_P (DECL_NAME (TREE_OPERAND (from, 1)))))
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return 1;
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/* fall through... */
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case NOP_EXPR:
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case CONVERT_EXPR:
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case NON_LVALUE_EXPR:
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case WITH_CLEANUP_EXPR:
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case SAVE_EXPR:
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case PREDECREMENT_EXPR:
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case PREINCREMENT_EXPR:
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case POSTDECREMENT_EXPR:
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case POSTINCREMENT_EXPR:
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if (value_safe_from_gc (to, TREE_OPERAND (from, 0)))
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return 1;
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break;
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case VAR_DECL:
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case PARM_DECL:
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/* We can safely pass these things as parameters to functions. */
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if (to == 0)
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return 1;
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case ARRAY_REF:
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case INDIRECT_REF:
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case RESULT_DECL:
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case OFFSET_REF:
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case CALL_EXPR:
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case METHOD_CALL_EXPR:
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break;
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case COMPOUND_EXPR:
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case TARGET_EXPR:
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if (value_safe_from_gc (to, TREE_OPERAND (from, 1)))
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return 1;
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break;
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case COND_EXPR:
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if (value_safe_from_gc (to, TREE_OPERAND (from, 1))
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&& value_safe_from_gc (to, TREE_OPERAND (from, 2)))
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return 1;
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break;
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case PLUS_EXPR:
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case MINUS_EXPR:
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if ((type_needs_gc_entry (TREE_TYPE (TREE_OPERAND (from, 0)))
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|| value_safe_from_gc (to, TREE_OPERAND (from, 0)))
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&& (type_needs_gc_entry (TREE_TYPE (TREE_OPERAND (from, 1))) == 0
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|| value_safe_from_gc (to, TREE_OPERAND (from, 1))))
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return 1;
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break;
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case RTL_EXPR:
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/* Every time we build an RTL_EXPR in the front-end, we must
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ensure that everything in it is safe from the garbage collector.
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??? This has only been done for `build_new'. */
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return 1;
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default:
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my_friendly_abort (41);
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}
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if (to == 0)
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return 0;
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/* FROM wasn't safe. But other properties of TO might make it safe. */
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switch (TREE_CODE (to))
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{
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case VAR_DECL:
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case PARM_DECL:
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/* We already culled out static VAR_DECLs above. */
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return 0;
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case COMPONENT_REF:
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/* These guys are special, and safe. */
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if (TREE_CODE (TREE_OPERAND (to, 1)) == FIELD_DECL
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&& (VFIELD_NAME_P (DECL_NAME (TREE_OPERAND (to, 1)))
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|| VBASE_NAME_P (DECL_NAME (TREE_OPERAND (to, 1)))))
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return 1;
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/* fall through... */
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case NOP_EXPR:
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case NON_LVALUE_EXPR:
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case WITH_CLEANUP_EXPR:
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case SAVE_EXPR:
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case PREDECREMENT_EXPR:
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case PREINCREMENT_EXPR:
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case POSTDECREMENT_EXPR:
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case POSTINCREMENT_EXPR:
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return value_safe_from_gc (TREE_OPERAND (to, 0), from);
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case COMPOUND_EXPR:
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case TARGET_EXPR:
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return value_safe_from_gc (TREE_OPERAND (to, 1), from);
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case COND_EXPR:
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return (value_safe_from_gc (TREE_OPERAND (to, 1), from)
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&& value_safe_from_gc (TREE_OPERAND (to, 2), from));
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case INDIRECT_REF:
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case ARRAY_REF:
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/* This used to be 0, but our current restricted model
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allows this to be 1. We'll never get arrays this way. */
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return 1;
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default:
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my_friendly_abort (42);
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}
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/* Catch-all case is that TO/FROM is not safe. */
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return 0;
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}
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/* Function to build a static GC entry for DECL. TYPE is DECL's type.
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For objects of type `class *', this is just an entry in the
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static vector __PTR_LIST__.
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For objects of type `class[]', this requires building an entry
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in the static vector __ARR_LIST__.
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For aggregates, this records all fields of type `class *'
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and `class[]' in the respective lists above. */
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void
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build_static_gc_entry (decl, type)
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tree decl;
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tree type;
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{
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/* Now, figure out what sort of entry to build. */
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if (TREE_CODE (type) == POINTER_TYPE
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|| TREE_CODE (type) == REFERENCE_TYPE)
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assemble_gc_entry (IDENTIFIER_POINTER (DECL_NAME (decl)));
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else if (TREE_CODE (type) == RECORD_TYPE)
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{
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tree ref = get_temp_name (build_reference_type (type), 1);
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DECL_INITIAL (ref) = build1 (ADDR_EXPR, TREE_TYPE (ref), decl);
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TREE_CONSTANT (DECL_INITIAL (ref)) = 1;
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finish_decl (ref, DECL_INITIAL (ref), 0, 0);
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}
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else
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{
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/* Not yet implemented.
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Cons up a static variable that holds address and length info
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and add that to ___ARR_LIST__. */
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my_friendly_abort (43);
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}
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}
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/* Protect FROM from the GC, assuming FROM is going to be
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stored into TO. We handle three cases for TO here:
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case 1: TO is a stack variable.
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case 2: TO is zero (which means it is a parameter).
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case 3: TO is a return value. */
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tree
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protect_value_from_gc (to, from)
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tree to, from;
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{
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if (to == 0)
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{
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tree cleanup;
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to = get_temp_regvar (TREE_TYPE (from), from);
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/* Convert from integer to list form since we'll use it twice. */
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DECL_GC_OFFSET (to) = build_tree_list (NULL_TREE, DECL_GC_OFFSET (to));
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cleanup = build_function_call (gc_unprotect_fndecl,
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DECL_GC_OFFSET (to));
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if (! expand_decl_cleanup (to, cleanup))
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{
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compiler_error ("cannot unprotect parameter in this scope");
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return error_mark_node;
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}
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}
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/* Should never need to protect a value that's headed for static storage. */
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if (TREE_STATIC (to))
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my_friendly_abort (44);
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switch (TREE_CODE (to))
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{
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case COMPONENT_REF:
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case INDIRECT_REF:
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return protect_value_from_gc (TREE_OPERAND (to, 0), from);
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case VAR_DECL:
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case PARM_DECL:
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{
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tree rval;
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if (DECL_GC_OFFSET (to) == NULL_TREE)
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{
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/* Because of a cast or a conversion, we might stick
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a value into a variable that would not normally
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have a GC entry. */
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DECL_GC_OFFSET (to) = size_int (++current_function_obstack_index);
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}
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if (TREE_CODE (DECL_GC_OFFSET (to)) != TREE_LIST)
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{
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DECL_GC_OFFSET (to)
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= build_tree_list (NULL_TREE, DECL_GC_OFFSET (to));
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}
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current_function_obstack_usage = 1;
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rval = build_function_call (gc_protect_fndecl,
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tree_cons (NULL_TREE, from,
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DECL_GC_OFFSET (to)));
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TREE_TYPE (rval) = TREE_TYPE (from);
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return rval;
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}
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}
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/* If we fall through the switch, assume we lost. */
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my_friendly_abort (45);
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/* NOTREACHED */
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return NULL_TREE;
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}
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/* Given the expression EXP of type `class *', return the head
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of the object pointed to by EXP. */
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tree
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build_headof (exp)
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tree exp;
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{
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tree type = TREE_TYPE (exp);
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tree vptr, offset;
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if (TREE_CODE (type) != POINTER_TYPE)
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{
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error ("`headof' applied to non-pointer type");
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return error_mark_node;
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}
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vptr = build1 (INDIRECT_REF, TYPE_POINTER_TO (vtable_entry_type), exp);
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offset = build_component_ref (build_array_ref (vptr, integer_one_node),
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get_identifier (VTABLE_DELTA_NAME),
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NULL_TREE, 0);
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return build (PLUS_EXPR, class_star_type_node, exp,
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convert (integer_type_node, offset));
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}
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/* Given the expression EXP of type `class *', return the
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type descriptor for the object pointed to by EXP. */
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tree
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build_classof (exp)
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tree exp;
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{
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tree type = TREE_TYPE (exp);
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tree vptr;
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tree t_desc_entry;
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if (TREE_CODE (type) != POINTER_TYPE)
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{
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error ("`classof' applied to non-pointer type");
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return error_mark_node;
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}
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vptr = build1 (INDIRECT_REF, TYPE_POINTER_TO (vtable_entry_type), exp);
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t_desc_entry = build_component_ref (build_array_ref (vptr, integer_one_node),
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get_identifier (VTABLE_PFN_NAME),
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NULL_TREE, 0);
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TREE_TYPE (t_desc_entry) = TYPE_POINTER_TO (__t_desc_type_node);
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return t_desc_entry;
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}
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/* Build and initialize various sorts of descriptors. Every descriptor
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node has a name associated with it (the name created by mangling).
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For this reason, we use the identifier as our access to the __*_desc
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nodes, instead of sticking them directly in the types. Otherwise we
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would burden all built-in types (and pointer types) with slots that
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we don't necessarily want to use.
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For each descriptor we build, we build a variable that contains
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the descriptor's information. When we need this info at runtime,
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all we need is access to these variables.
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Note: these constructors always return the address of the descriptor
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info, since that is simplest for their mutual interaction. */
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static tree
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build_generic_desc (decl, elems)
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tree decl;
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tree elems;
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{
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tree init = build (CONSTRUCTOR, TREE_TYPE (decl), NULL_TREE, elems);
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TREE_CONSTANT (init) = 1;
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TREE_STATIC (init) = 1;
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TREE_READONLY (init) = 1;
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DECL_INITIAL (decl) = init;
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TREE_STATIC (decl) = 1;
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layout_decl (decl, 0);
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finish_decl (decl, init, 0, 0);
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return IDENTIFIER_AS_DESC (DECL_NAME (decl));
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}
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/* Build an initializer for a __t_desc node. So that we can take advantage
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of recursion, we accept NULL for TYPE.
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DEFINITION is greater than zero iff we must define the type descriptor
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(as opposed to merely referencing it). 1 means treat according to
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#pragma interface/#pragma implementation rules. 2 means define as
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global and public, no matter what. */
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tree
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build_t_desc (type, definition)
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tree type;
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int definition;
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{
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tree tdecl;
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tree tname, name_string;
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tree elems, fields;
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tree parents, vbases, offsets, ivars, methods, target_type;
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int method_count = 0, field_count = 0;
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if (type == NULL_TREE)
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return NULL_TREE;
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tname = build_t_desc_overload (type);
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if (IDENTIFIER_AS_DESC (tname)
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&& (!definition || TREE_ASM_WRITTEN (IDENTIFIER_AS_DESC (tname))))
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return IDENTIFIER_AS_DESC (tname);
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tdecl = lookup_name (tname, 0);
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if (tdecl == NULL_TREE)
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{
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tdecl = build_decl (VAR_DECL, tname, __t_desc_type_node);
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DECL_EXTERNAL (tdecl) = 1;
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TREE_PUBLIC (tdecl) = 1;
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tdecl = pushdecl_top_level (tdecl);
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}
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/* If we previously defined it, return the defined result. */
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else if (definition && DECL_INITIAL (tdecl))
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return IDENTIFIER_AS_DESC (tname);
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if (definition)
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{
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tree taggr = type;
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/* Let T* and T& be written only when T is written (if T is an aggr).
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We do this for const, but not for volatile, since volatile
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is rare and const is not. */
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if (!TYPE_VOLATILE (taggr)
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&& (TREE_CODE (taggr) == POINTER_TYPE
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|| TREE_CODE (taggr) == REFERENCE_TYPE)
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&& IS_AGGR_TYPE (TREE_TYPE (taggr)))
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taggr = TREE_TYPE (taggr);
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/* If we know that we don't need to write out this type's
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vtable, then don't write out it's dossier. Somebody
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else will take care of that. */
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if (IS_AGGR_TYPE (taggr) && CLASSTYPE_VFIELD (taggr))
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{
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if (CLASSTYPE_VTABLE_NEEDS_WRITING (taggr))
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{
|
||
TREE_PUBLIC (tdecl) = !(CLASSTYPE_INTERFACE_ONLY (taggr)
|
||
|| CLASSTYPE_INTERFACE_UNKNOWN (taggr));
|
||
TREE_STATIC (tdecl) = 1;
|
||
DECL_EXTERNAL (tdecl) = 0;
|
||
}
|
||
else
|
||
{
|
||
if (write_virtuals != 0)
|
||
TREE_PUBLIC (tdecl) = 1;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
DECL_EXTERNAL (tdecl) = 0;
|
||
TREE_STATIC (tdecl) = 1;
|
||
TREE_PUBLIC (tdecl) = (definition > 1);
|
||
}
|
||
}
|
||
SET_IDENTIFIER_AS_DESC (tname, build_unary_op (ADDR_EXPR, tdecl, 0));
|
||
if (!definition || DECL_EXTERNAL (tdecl))
|
||
{
|
||
/* That's it! */
|
||
finish_decl (tdecl, 0, 0, 0);
|
||
return IDENTIFIER_AS_DESC (tname);
|
||
}
|
||
|
||
/* Show that we are defining the t_desc for this type. */
|
||
DECL_INITIAL (tdecl) = error_mark_node;
|
||
|
||
parents = build_tree_list (NULL_TREE, integer_zero_node);
|
||
vbases = build_tree_list (NULL_TREE, integer_zero_node);
|
||
offsets = build_tree_list (NULL_TREE, integer_zero_node);
|
||
methods = NULL_TREE;
|
||
ivars = NULL_TREE;
|
||
|
||
if (TYPE_LANG_SPECIFIC (type))
|
||
{
|
||
int i = CLASSTYPE_N_BASECLASSES (type);
|
||
tree method_vec = CLASSTYPE_METHOD_VEC (type);
|
||
tree *meth, *end;
|
||
tree binfos = TYPE_BINFO_BASETYPES (type);
|
||
tree vb = CLASSTYPE_VBASECLASSES (type);
|
||
|
||
while (--i >= 0)
|
||
parents = tree_cons (NULL_TREE, build_t_desc (BINFO_TYPE (TREE_VEC_ELT (binfos, i)), 0), parents);
|
||
|
||
while (vb)
|
||
{
|
||
vbases = tree_cons (NULL_TREE, build_t_desc (BINFO_TYPE (vb), 0), vbases);
|
||
offsets = tree_cons (NULL_TREE, BINFO_OFFSET (vb), offsets);
|
||
vb = TREE_CHAIN (vb);
|
||
}
|
||
|
||
if (method_vec)
|
||
for (meth = TREE_VEC_END (method_vec),
|
||
end = &TREE_VEC_ELT (method_vec, 0); meth-- != end; )
|
||
if (*meth)
|
||
{
|
||
methods = tree_cons (NULL_TREE, build_m_desc (*meth), methods);
|
||
method_count++;
|
||
}
|
||
}
|
||
|
||
if (IS_AGGR_TYPE (type))
|
||
{
|
||
for (fields = TYPE_FIELDS (type); fields; fields = TREE_CHAIN (fields))
|
||
if (TREE_CODE (fields) == FIELD_DECL
|
||
|| TREE_CODE (fields) == VAR_DECL)
|
||
{
|
||
ivars = tree_cons (NULL_TREE, build_i_desc (fields), ivars);
|
||
field_count++;
|
||
}
|
||
ivars = nreverse (ivars);
|
||
}
|
||
|
||
parents = finish_table (0, TYPE_POINTER_TO (__t_desc_type_node), parents, 0);
|
||
vbases = finish_table (0, TYPE_POINTER_TO (__t_desc_type_node), vbases, 0);
|
||
offsets = finish_table (0, integer_type_node, offsets, 0);
|
||
methods = finish_table (0, __m_desc_type_node, methods, 0);
|
||
ivars = finish_table (0, __i_desc_type_node, ivars, 0);
|
||
if (TREE_TYPE (type))
|
||
target_type = build_t_desc (TREE_TYPE (type), definition);
|
||
else
|
||
target_type = integer_zero_node;
|
||
|
||
name_string = combine_strings (build_string (IDENTIFIER_LENGTH (tname)+1, IDENTIFIER_POINTER (tname)));
|
||
|
||
elems = tree_cons (NULL_TREE, build_unary_op (ADDR_EXPR, name_string, 0),
|
||
tree_cons (NULL_TREE,
|
||
TYPE_SIZE(type)? size_in_bytes(type) : integer_zero_node,
|
||
/* really should use bitfield initialization here. */
|
||
tree_cons (NULL_TREE, integer_zero_node,
|
||
tree_cons (NULL_TREE, target_type,
|
||
tree_cons (NULL_TREE, build_int_2 (field_count, 2),
|
||
tree_cons (NULL_TREE, build_int_2 (method_count, 2),
|
||
tree_cons (NULL_TREE, build_unary_op (ADDR_EXPR, ivars, 0),
|
||
tree_cons (NULL_TREE, build_unary_op (ADDR_EXPR, methods, 0),
|
||
tree_cons (NULL_TREE, build_unary_op (ADDR_EXPR, parents, 0),
|
||
tree_cons (NULL_TREE, build_unary_op (ADDR_EXPR, vbases, 0),
|
||
build_tree_list (NULL_TREE, build_unary_op (ADDR_EXPR, offsets, 0))))))))))));
|
||
return build_generic_desc (tdecl, elems);
|
||
}
|
||
|
||
/* Build an initializer for a __i_desc node. */
|
||
tree
|
||
build_i_desc (decl)
|
||
tree decl;
|
||
{
|
||
tree elems, name_string;
|
||
tree taggr;
|
||
|
||
name_string = DECL_NAME (decl);
|
||
name_string = combine_strings (build_string (IDENTIFIER_LENGTH (name_string)+1, IDENTIFIER_POINTER (name_string)));
|
||
|
||
/* Now decide whether this ivar should cause it's type to get
|
||
def'd or ref'd in this file. If the type we are looking at
|
||
has a proxy definition, we look at the proxy (i.e., a
|
||
`foo *' is equivalent to a `foo'). */
|
||
taggr = TREE_TYPE (decl);
|
||
|
||
if ((TREE_CODE (taggr) == POINTER_TYPE
|
||
|| TREE_CODE (taggr) == REFERENCE_TYPE)
|
||
&& TYPE_VOLATILE (taggr) == 0)
|
||
taggr = TREE_TYPE (taggr);
|
||
|
||
elems = tree_cons (NULL_TREE, build_unary_op (ADDR_EXPR, name_string, 0),
|
||
tree_cons (NULL_TREE, DECL_FIELD_BITPOS (decl),
|
||
build_tree_list (NULL_TREE, build_t_desc (TREE_TYPE (decl),
|
||
! IS_AGGR_TYPE (taggr)))));
|
||
taggr = build (CONSTRUCTOR, __i_desc_type_node, NULL_TREE, elems);
|
||
TREE_CONSTANT (taggr) = 1;
|
||
TREE_STATIC (taggr) = 1;
|
||
TREE_READONLY (taggr) = 1;
|
||
return taggr;
|
||
}
|
||
|
||
/* Build an initializer for a __m_desc node. */
|
||
tree
|
||
build_m_desc (decl)
|
||
tree decl;
|
||
{
|
||
tree taggr, elems, name_string;
|
||
tree parm_count, req_count, vindex, vcontext;
|
||
tree parms;
|
||
int p_count, r_count;
|
||
tree parm_types = NULL_TREE;
|
||
|
||
for (parms = TYPE_ARG_TYPES (TREE_TYPE (decl)), p_count = 0, r_count = 0;
|
||
parms != NULL_TREE; parms = TREE_CHAIN (parms), p_count++)
|
||
{
|
||
taggr = TREE_VALUE (parms);
|
||
if ((TREE_CODE (taggr) == POINTER_TYPE
|
||
|| TREE_CODE (taggr) == REFERENCE_TYPE)
|
||
&& TYPE_VOLATILE (taggr) == 0)
|
||
taggr = TREE_TYPE (taggr);
|
||
|
||
parm_types = tree_cons (NULL_TREE, build_t_desc (TREE_VALUE (parms),
|
||
! IS_AGGR_TYPE (taggr)),
|
||
parm_types);
|
||
if (TREE_PURPOSE (parms) == NULL_TREE)
|
||
r_count++;
|
||
}
|
||
|
||
parm_types = finish_table (0, TYPE_POINTER_TO (__t_desc_type_node),
|
||
nreverse (parm_types), 0);
|
||
parm_count = build_int_2 (p_count, 0);
|
||
req_count = build_int_2 (r_count, 0);
|
||
|
||
if (DECL_VINDEX (decl))
|
||
vindex = DECL_VINDEX (decl);
|
||
else
|
||
vindex = integer_zero_node;
|
||
if (DECL_CONTEXT (decl)
|
||
&& TREE_CODE_CLASS (TREE_CODE (DECL_CONTEXT (decl))) == 't')
|
||
vcontext = build_t_desc (DECL_CONTEXT (decl), 0);
|
||
else
|
||
vcontext = integer_zero_node;
|
||
name_string = DECL_NAME (decl);
|
||
if (name_string == NULL)
|
||
name_string = DECL_ASSEMBLER_NAME (decl);
|
||
name_string = combine_strings (build_string (IDENTIFIER_LENGTH (name_string)+1, IDENTIFIER_POINTER (name_string)));
|
||
|
||
/* Now decide whether the return type of this mvar
|
||
should cause it's type to get def'd or ref'd in this file.
|
||
If the type we are looking at has a proxy definition,
|
||
we look at the proxy (i.e., a `foo *' is equivalent to a `foo'). */
|
||
taggr = TREE_TYPE (TREE_TYPE (decl));
|
||
|
||
if ((TREE_CODE (taggr) == POINTER_TYPE
|
||
|| TREE_CODE (taggr) == REFERENCE_TYPE)
|
||
&& TYPE_VOLATILE (taggr) == 0)
|
||
taggr = TREE_TYPE (taggr);
|
||
|
||
elems = tree_cons (NULL_TREE, build_unary_op (ADDR_EXPR, name_string, 0),
|
||
tree_cons (NULL_TREE, vindex,
|
||
tree_cons (NULL_TREE, vcontext,
|
||
tree_cons (NULL_TREE, build_t_desc (TREE_TYPE (TREE_TYPE (decl)),
|
||
! IS_AGGR_TYPE (taggr)),
|
||
tree_cons (NULL_TREE, build_c_cast (TYPE_POINTER_TO (default_function_type), build_unary_op (ADDR_EXPR, decl, 0)),
|
||
tree_cons (NULL_TREE, parm_count,
|
||
tree_cons (NULL_TREE, req_count,
|
||
build_tree_list (NULL_TREE, build_unary_op (ADDR_EXPR, parm_types, 0)))))))));
|
||
|
||
taggr = build (CONSTRUCTOR, __m_desc_type_node, NULL_TREE, elems);
|
||
TREE_CONSTANT (taggr) = 1;
|
||
TREE_STATIC (taggr) = 1;
|
||
TREE_READONLY (taggr) = 1;
|
||
return taggr;
|
||
}
|
||
|
||
/* Conditionally emit code to set up an unwind-protect for the
|
||
garbage collector. If this function doesn't do anything that involves
|
||
the garbage collector, then do nothing. Otherwise, call __gc_push
|
||
at the beginning and __gc_pop at the end.
|
||
|
||
NOTE! The __gc_pop function must operate transparently, since
|
||
it comes where the logical return label lies. This means that
|
||
at runtime *it* must preserve any return value registers. */
|
||
|
||
void
|
||
expand_gc_prologue_and_epilogue ()
|
||
{
|
||
extern tree maybe_gc_cleanup;
|
||
struct rtx_def *last_parm_insn, *mark;
|
||
extern struct rtx_def *get_last_insn ();
|
||
extern struct rtx_def *get_first_nonparm_insn ();
|
||
extern struct rtx_def *previous_insn ();
|
||
tree action;
|
||
|
||
/* If we didn't need the obstack, don't cons any space. */
|
||
if (current_function_obstack_index == 0
|
||
|| current_function_obstack_usage == 0)
|
||
return;
|
||
|
||
mark = get_last_insn ();
|
||
last_parm_insn = get_first_nonparm_insn ();
|
||
if (last_parm_insn == 0) last_parm_insn = mark;
|
||
else last_parm_insn = previous_insn (last_parm_insn);
|
||
|
||
action = build_function_call (gc_push_fndecl,
|
||
build_tree_list (NULL_TREE, size_int (++current_function_obstack_index)));
|
||
expand_expr_stmt (action);
|
||
|
||
reorder_insns (next_insn (mark), get_last_insn (), last_parm_insn);
|
||
|
||
/* This will be expanded as a cleanup. */
|
||
TREE_VALUE (maybe_gc_cleanup)
|
||
= build_function_call (gc_pop_fndecl, NULL_TREE);
|
||
}
|
||
|
||
/* Some day we'll use this function as a call-back and clean
|
||
up all the unnecessary gc dribble that we otherwise create. */
|
||
void
|
||
lang_expand_end_bindings (first, last)
|
||
struct rtx_def *first, *last;
|
||
{
|
||
}
|
||
|
||
void
|
||
init_gc_processing ()
|
||
{
|
||
tree parmtypes = hash_tree_chain (class_star_type_node,
|
||
hash_tree_chain (integer_type_node, NULL_TREE));
|
||
gc_protect_fndecl = define_function ("__gc_protect",
|
||
build_function_type (class_star_type_node, parmtypes),
|
||
NOT_BUILT_IN, 0, 0);
|
||
|
||
parmtypes = hash_tree_chain (integer_type_node, NULL_TREE);
|
||
gc_unprotect_fndecl = define_function ("__gc_unprotect",
|
||
build_function_type (void_type_node, parmtypes),
|
||
NOT_BUILT_IN, 0, 0);
|
||
|
||
gc_push_fndecl = define_function ("__gc_push",
|
||
TREE_TYPE (gc_unprotect_fndecl),
|
||
NOT_BUILT_IN, 0, 0);
|
||
|
||
gc_pop_fndecl = define_function ("__gc_pop",
|
||
build_function_type (void_type_node,
|
||
void_list_node),
|
||
NOT_BUILT_IN, 0, 0);
|
||
gc_nonobject = build_int_2 (0x80000000, 0);
|
||
gc_visible = build_int_2 (0x40000000, 0);
|
||
gc_white = integer_zero_node;
|
||
gc_offwhite = build_int_2 (0x10000000, 0);
|
||
gc_grey = build_int_2 (0x20000000, 0);
|
||
gc_black = build_int_2 (0x30000000, 0);
|
||
}
|