1 /* Data structure definitions for a generic GCC target.
2 Copyright (C) 2001 Free Software Foundation, Inc.
4 This program is free software; you can redistribute it and/or modify it
5 under the terms of the GNU General Public License as published by the
6 Free Software Foundation; either version 2, or (at your option) any
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
18 In other words, you are welcome to use, share and improve this program.
19 You are forbidden to forbid anyone else to use, share and improve
20 what you give them. Help stamp out software-hoarding! */
22 /* This file contains a data structure that describes a GCC target.
23 At present it is incomplete, but in future it should grow to
24 contain most or all target machine and target O/S specific
27 This structure has its initializer declared in target-def.h in the
28 form of large macro TARGET_INITIALIZER that expands to many smaller
31 The smaller macros each initialize one component of the structure,
32 and each has a default. Each target should have a file that
33 includes target.h and target-def.h, and overrides any inappropriate
34 defaults by undefining the relevant macro and defining a suitable
35 replacement. That file should then contain the definition of
38 struct gcc_target targetm = TARGET_INITIALIZER;
40 Doing things this way allows us to bring together everything that
41 defines a GCC target. By supplying a default that is appropriate
42 to most targets, we can easily add new items without needing to
43 edit dozens of target configuration files. It should also allow us
44 to gradually reduce the amount of conditional compilation that is
45 scattered throughout GCC. */
47 /* Forward declaration for the benefit of prototypes. */
52 /* Functions that output assembler for the target. */
55 /* Opening and closing parentheses for asm expression grouping. */
56 const char *open_paren, *close_paren;
58 /* Output the assembler code for entry to a function. */
59 void (* function_prologue) PARAMS ((FILE *, HOST_WIDE_INT));
61 /* Output the assembler code for end of prologue. */
62 void (* function_end_prologue) PARAMS ((FILE *));
64 /* Output the assembler code for start of epilogue. */
65 void (* function_begin_epilogue) PARAMS ((FILE *));
67 /* Output the assembler code for function exit. */
68 void (* function_epilogue) PARAMS ((FILE *, HOST_WIDE_INT));
70 /* Switch to an arbitrary section NAME with attributes as
71 specified by FLAGS. */
72 void (* named_section) PARAMS ((const char *, unsigned int));
74 /* Output a constructor for a symbol with a given priority. */
75 void (* constructor) PARAMS ((struct rtx_def *, int));
77 /* Output a destructor for a symbol with a given priority. */
78 void (* destructor) PARAMS ((struct rtx_def *, int));
81 /* Given two decls, merge their attributes and return the result. */
82 tree (* merge_decl_attributes) PARAMS ((tree, tree));
84 /* Given two types, merge their attributes and return the result. */
85 tree (* merge_type_attributes) PARAMS ((tree, tree));
87 /* Return nonzero if IDENTIFIER with arguments ARGS is a valid machine
88 specific attribute for DECL. The attributes in ATTRIBUTES have
89 previously been assigned to DECL. */
90 int (* valid_decl_attribute) PARAMS ((tree decl, tree attributes,
91 tree identifier, tree args));
93 /* Return nonzero if IDENTIFIER with arguments ARGS is a valid machine
94 specific attribute for TYPE. The attributes in ATTRIBUTES have
95 previously been assigned to TYPE. */
96 int (* valid_type_attribute) PARAMS ((tree type, tree attributes,
97 tree identifier, tree args));
99 /* Return zero if the attributes on TYPE1 and TYPE2 are incompatible,
100 one if they are compatible and two if they are nearly compatible
101 (which causes a warning to be generated). */
102 int (* comp_type_attributes) PARAMS ((tree type1, tree type2));
104 /* Assign default attributes to the newly defined TYPE. */
105 void (* set_default_type_attributes) PARAMS ((tree type));
107 /* Insert attributes on the newly created DECL. */
108 void (* insert_attributes) PARAMS ((tree decl, tree *attributes));
110 /* Set up target-specific built-in functions. */
111 void (* init_builtins) PARAMS ((void));
113 /* Expand a target-specific builtin. */
114 struct rtx_def * (* expand_builtin) PARAMS ((tree exp,
115 struct rtx_def *target,
116 struct rtx_def *subtarget,
117 enum machine_mode mode,
120 /* Given a decl, a section name, and whether the decl initializer
121 has relocs, choose attributes for the section. */
122 /* ??? Should be merged with SELECT_SECTION and UNIQUE_SECTION. */
123 unsigned int (* section_type_flags) PARAMS ((tree, const char *, int));
125 /* True if arbitrary sections are supported. */
126 bool have_named_sections;
128 /* True if "native" constructors and destructors are supported,
129 false if we're using collect2 for the job. */
130 bool have_ctors_dtors;
133 extern struct gcc_target targetm;