1 /****************************************************************************
3 * GNAT COMPILER COMPONENTS *
5 * GNAT-SPECIFIC GCC TREE CODES *
11 * Copyright (C) 1992-2001 Free Software Foundation, Inc. *
13 * GNAT is free software; you can redistribute it and/or modify it under *
14 * terms of the GNU General Public License as published by the Free Soft- *
15 * ware Foundation; either version 2, or (at your option) any later ver- *
16 * sion. GNAT is distributed in the hope that it will be useful, but WITH- *
17 * OUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY *
18 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License *
19 * for more details. You should have received a copy of the GNU General *
20 * Public License distributed with GNAT; see file COPYING. If not, write *
21 * to the Free Software Foundation, 59 Temple Place - Suite 330, Boston, *
22 * MA 02111-1307, USA. *
24 * GNAT was originally developed by the GNAT team at New York University. *
25 * It is now maintained by Ada Core Technologies Inc (http://www.gnat.com). *
27 ****************************************************************************/
29 /* A GNAT tree node to transform to a GCC tree. This is only used when the
30 node would generate code, rather then just a tree, and we are in the global
33 The only field used is TREE_COMPLEXITY, which contains the GNAT node
36 DEFTREECODE (TRANSFORM_EXPR, "transform_expr", 'e', 0)
38 /* Perform an unchecked conversion between the input and the output.
39 if TREE_ADDRESSABLE is set, it means this is in an LHS; in that case,
40 we can only use techniques, such as pointer punning, that leave the
41 expression a "name". */
43 DEFTREECODE (UNCHECKED_CONVERT_EXPR, "unchecked_convert_expr", '1', 1)
45 /* Dynamically allocate on the stack a number of bytes of memory given
46 by operand 0 at the alignment given by operand 1 and return the
47 address of the resulting memory. */
49 DEFTREECODE (ALLOCATE_EXPR, "allocate_expr", '2', 2)
51 /* A type that is an unconstrained array itself. This node is never passed
52 to GCC. TREE_TYPE is the type of the fat pointer and TYPE_OBJECT_RECORD_TYPE
53 is the type of a record containing the template and data. */
55 DEFTREECODE (UNCONSTRAINED_ARRAY_TYPE, "unconstrained_array_type", 't', 0)
57 /* A reference to an unconstrained array. This node only exists as an
58 intermediate node during the translation of a GNAT tree to a GCC tree;
59 it is never passed to GCC. The only field used is operand 0, which
60 is the fat pointer object. */
62 DEFTREECODE (UNCONSTRAINED_ARRAY_REF, "unconstrained_array_ref", 'r', 1)
64 /* An expression that returns an RTL suitable for its type. Operand 0
65 is an expression to be evaluated for side effects only. */
67 DEFTREECODE (NULL_EXPR, "null_expr", 'e', 1)
69 /* An expression that emits a USE for its single operand. */
71 DEFTREECODE (USE_EXPR, "use_expr", 'e', 1)
73 /* Same as ADDR_EXPR, except that if the operand represents a bit field,
74 return the address of the byte containing the bit. This is used
75 for the 'Address attribute and never shows up in the tree. */
76 DEFTREECODE (ATTR_ADDR_EXPR, "attr_addr_expr", 'r', 1)
78 /* An expression that is treated as a conversion while generating code, but is
79 used to prevent infinite recursion when conversions of biased types are
82 DEFTREECODE (GNAT_NOP_EXPR, "gnat_nop_expr", '1', 1)
84 /* This is used as a place to store the ID of a loop.
86 ??? This should be redone at some point. */
88 DEFTREECODE (GNAT_LOOP_ID, "gnat_loop_id", 'x', 1)