1 /* M32C Pragma support
2 Copyright (C) 2004-2020 Free Software Foundation, Inc.
3 Contributed by Red Hat, Inc.
4
5 This file is part of GCC.
6
7 GCC is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3, or (at your option)
10 any later version.
11
12 GCC is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
16
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20
21 #define IN_TARGET_CODE 1
22
23 #include "config.h"
24 #include "system.h"
25 #include "coretypes.h"
26 #include "tm.h"
27 #include "c-family/c-common.h"
28 #include "c-family/c-pragma.h"
29 #include "m32c-protos.h"
30
31 /* Implements the "GCC memregs" pragma. This pragma takes only an
32 integer, and is semantically identical to the -memregs= command
33 line option. The only catch is, the programmer should only use
34 this pragma at the beginning of the file (preferably, in some
35 project-wide header) to avoid ABI changes related to changing the
36 list of available "registers". */
37 static void
m32c_pragma_memregs(cpp_reader * reader ATTRIBUTE_UNUSED)38 m32c_pragma_memregs (cpp_reader * reader ATTRIBUTE_UNUSED)
39 {
40 /* on off */
41 tree val;
42 enum cpp_ttype type;
43 HOST_WIDE_INT i;
44
45 type = pragma_lex (&val);
46 if (type == CPP_NUMBER)
47 {
48 if (tree_fits_uhwi_p (val))
49 {
50 i = tree_to_uhwi (val);
51
52 type = pragma_lex (&val);
53 if (type != CPP_EOF)
54 warning (0, "junk at end of #pragma GCC memregs [0..16]");
55
56 if (i >= 0 && i <= 16)
57 {
58 if (!ok_to_change_target_memregs)
59 {
60 warning (0,
61 "#pragma GCC memregs must precede any function decls");
62 return;
63 }
64 target_memregs = i;
65 m32c_conditional_register_usage ();
66 }
67 else
68 {
69 warning (0, "#pragma GCC memregs takes a number [0..16]");
70 }
71
72 return;
73 }
74 }
75
76 error ("#pragma GCC memregs takes a number [0..16]");
77 }
78
79 /* Implements the "pragma ADDRESS" pragma. This pragma takes a
80 variable name and an address, and arranges for that variable to be
81 "at" that address. The variable is also made volatile. */
82 static void
m32c_pragma_address(cpp_reader * reader ATTRIBUTE_UNUSED)83 m32c_pragma_address (cpp_reader * reader ATTRIBUTE_UNUSED)
84 {
85 /* on off */
86 tree var, addr;
87 enum cpp_ttype type;
88
89 type = pragma_lex (&var);
90 if (type == CPP_NAME)
91 {
92 type = pragma_lex (&addr);
93 if (type == CPP_NUMBER)
94 {
95 if (var != error_mark_node)
96 {
97 unsigned uaddr = tree_to_uhwi (addr);
98 m32c_note_pragma_address (IDENTIFIER_POINTER (var), uaddr);
99 }
100
101 type = pragma_lex (&var);
102 if (type != CPP_EOF)
103 {
104 error ("junk at end of #pragma ADDRESS");
105 }
106 return;
107 }
108 }
109 error ("malformed #pragma ADDRESS variable address");
110 }
111
112 /* Implements REGISTER_TARGET_PRAGMAS. */
113 void
m32c_register_pragmas(void)114 m32c_register_pragmas (void)
115 {
116 c_register_pragma ("GCC", "memregs", m32c_pragma_memregs);
117 c_register_pragma (NULL, "ADDRESS", m32c_pragma_address);
118 c_register_pragma (NULL, "address", m32c_pragma_address);
119
120 /* R8C and M16C have 16-bit pointers in a 20-bit address zpace.
121 M32C has 24-bit pointers in a 24-bit address space, so does not
122 need far pointers, but we accept the qualifier anyway, as a
123 no-op. */
124 if (TARGET_A16)
125 c_register_addr_space ("__far", ADDR_SPACE_FAR);
126 else
127 c_register_addr_space ("__far", ADDR_SPACE_GENERIC);
128 }
129