605 lines
21 KiB
C
605 lines
21 KiB
C
/* Generate information regarding function declarations and definitions based
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on information stored in GCC's tree structure. This code implements the
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-aux-info option.
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Copyright (C) 1989, 1991, 1994, 1995, 1997, 1998,
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1999, 2000 Free Software Foundation, Inc.
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Contributed by Ron Guilmette (rfg@segfault.us.com).
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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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 GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "toplev.h"
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#include "flags.h"
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#include "tree.h"
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#include "c-tree.h"
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enum formals_style_enum {
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ansi,
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k_and_r_names,
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k_and_r_decls
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};
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typedef enum formals_style_enum formals_style;
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static const char *data_type;
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static char *affix_data_type PARAMS ((const char *)) ATTRIBUTE_MALLOC;
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static const char *gen_formal_list_for_type PARAMS ((tree, formals_style));
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static int deserves_ellipsis PARAMS ((tree));
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static const char *gen_formal_list_for_func_def PARAMS ((tree, formals_style));
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static const char *gen_type PARAMS ((const char *, tree, formals_style));
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static const char *gen_decl PARAMS ((tree, int, formals_style));
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/* Given a string representing an entire type or an entire declaration
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which only lacks the actual "data-type" specifier (at its left end),
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affix the data-type specifier to the left end of the given type
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specification or object declaration.
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Because of C language weirdness, the data-type specifier (which normally
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goes in at the very left end) may have to be slipped in just to the
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right of any leading "const" or "volatile" qualifiers (there may be more
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than one). Actually this may not be strictly necessary because it seems
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that GCC (at least) accepts `<data-type> const foo;' and treats it the
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same as `const <data-type> foo;' but people are accustomed to seeing
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`const char *foo;' and *not* `char const *foo;' so we try to create types
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that look as expected. */
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static char *
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affix_data_type (param)
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const char *param;
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{
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char *const type_or_decl = ASTRDUP (param);
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char *p = type_or_decl;
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char *qualifiers_then_data_type;
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char saved;
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/* Skip as many leading const's or volatile's as there are. */
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for (;;)
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{
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if (!strncmp (p, "volatile ", 9))
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{
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p += 9;
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continue;
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}
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if (!strncmp (p, "const ", 6))
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{
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p += 6;
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continue;
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}
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break;
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}
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/* p now points to the place where we can insert the data type. We have to
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add a blank after the data-type of course. */
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if (p == type_or_decl)
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return concat (data_type, " ", type_or_decl, NULL);
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saved = *p;
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*p = '\0';
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qualifiers_then_data_type = concat (type_or_decl, data_type, NULL);
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*p = saved;
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return reconcat (qualifiers_then_data_type,
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qualifiers_then_data_type, " ", p, NULL);
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}
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/* Given a tree node which represents some "function type", generate the
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source code version of a formal parameter list (of some given style) for
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this function type. Return the whole formal parameter list (including
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a pair of surrounding parens) as a string. Note that if the style
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we are currently aiming for is non-ansi, then we just return a pair
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of empty parens here. */
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static const char *
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gen_formal_list_for_type (fntype, style)
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tree fntype;
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formals_style style;
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{
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const char *formal_list = "";
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tree formal_type;
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if (style != ansi)
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return "()";
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formal_type = TYPE_ARG_TYPES (fntype);
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while (formal_type && TREE_VALUE (formal_type) != void_type_node)
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{
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const char *this_type;
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if (*formal_list)
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formal_list = concat (formal_list, ", ", NULL);
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this_type = gen_type ("", TREE_VALUE (formal_type), ansi);
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formal_list
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= ((strlen (this_type))
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? concat (formal_list, affix_data_type (this_type), NULL)
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: concat (formal_list, data_type, NULL));
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formal_type = TREE_CHAIN (formal_type);
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}
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/* If we got to here, then we are trying to generate an ANSI style formal
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parameters list.
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New style prototyped ANSI formal parameter lists should in theory always
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contain some stuff between the opening and closing parens, even if it is
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only "void".
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The brutal truth though is that there is lots of old K&R code out there
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which contains declarations of "pointer-to-function" parameters and
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these almost never have fully specified formal parameter lists associated
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with them. That is, the pointer-to-function parameters are declared
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with just empty parameter lists.
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In cases such as these, protoize should really insert *something* into
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the vacant parameter lists, but what? It has no basis on which to insert
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anything in particular.
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Here, we make life easy for protoize by trying to distinguish between
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K&R empty parameter lists and new-style prototyped parameter lists
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that actually contain "void". In the latter case we (obviously) want
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to output the "void" verbatim, and that what we do. In the former case,
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we do our best to give protoize something nice to insert.
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This "something nice" should be something that is still valid (when
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re-compiled) but something that can clearly indicate to the user that
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more typing information (for the parameter list) should be added (by
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hand) at some convenient moment.
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The string chosen here is a comment with question marks in it. */
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if (!*formal_list)
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{
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if (TYPE_ARG_TYPES (fntype))
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/* assert (TREE_VALUE (TYPE_ARG_TYPES (fntype)) == void_type_node); */
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formal_list = "void";
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else
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formal_list = "/* ??? */";
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}
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else
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{
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/* If there were at least some parameters, and if the formals-types-list
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petered out to a NULL (i.e. without being terminated by a
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void_type_node) then we need to tack on an ellipsis. */
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if (!formal_type)
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formal_list = concat (formal_list, ", ...", NULL);
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}
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return concat (" (", formal_list, ")", NULL);
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}
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/* For the generation of an ANSI prototype for a function definition, we have
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to look at the formal parameter list of the function's own "type" to
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determine if the function's formal parameter list should end with an
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ellipsis. Given a tree node, the following function will return non-zero
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if the "function type" parameter list should end with an ellipsis. */
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static int
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deserves_ellipsis (fntype)
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tree fntype;
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{
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tree formal_type;
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formal_type = TYPE_ARG_TYPES (fntype);
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while (formal_type && TREE_VALUE (formal_type) != void_type_node)
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formal_type = TREE_CHAIN (formal_type);
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/* If there were at least some parameters, and if the formals-types-list
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petered out to a NULL (i.e. without being terminated by a void_type_node)
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then we need to tack on an ellipsis. */
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return (!formal_type && TYPE_ARG_TYPES (fntype));
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}
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/* Generate a parameter list for a function definition (in some given style).
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Note that this routine has to be separate (and different) from the code that
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generates the prototype parameter lists for function declarations, because
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in the case of a function declaration, all we have to go on is a tree node
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representing the function's own "function type". This can tell us the types
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of all of the formal parameters for the function, but it cannot tell us the
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actual *names* of each of the formal parameters. We need to output those
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parameter names for each function definition.
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This routine gets a pointer to a tree node which represents the actual
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declaration of the given function, and this DECL node has a list of formal
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parameter (variable) declarations attached to it. These formal parameter
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(variable) declaration nodes give us the actual names of the formal
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parameters for the given function definition.
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This routine returns a string which is the source form for the entire
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function formal parameter list. */
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static const char *
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gen_formal_list_for_func_def (fndecl, style)
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tree fndecl;
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formals_style style;
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{
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const char *formal_list = "";
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tree formal_decl;
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formal_decl = DECL_ARGUMENTS (fndecl);
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while (formal_decl)
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{
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const char *this_formal;
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if (*formal_list && ((style == ansi) || (style == k_and_r_names)))
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formal_list = concat (formal_list, ", ", NULL);
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this_formal = gen_decl (formal_decl, 0, style);
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if (style == k_and_r_decls)
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formal_list = concat (formal_list, this_formal, "; ", NULL);
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else
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formal_list = concat (formal_list, this_formal, NULL);
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formal_decl = TREE_CHAIN (formal_decl);
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}
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if (style == ansi)
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{
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if (!DECL_ARGUMENTS (fndecl))
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formal_list = concat (formal_list, "void", NULL);
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if (deserves_ellipsis (TREE_TYPE (fndecl)))
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formal_list = concat (formal_list, ", ...", NULL);
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}
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if ((style == ansi) || (style == k_and_r_names))
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formal_list = concat (" (", formal_list, ")", NULL);
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return formal_list;
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}
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/* Generate a string which is the source code form for a given type (t). This
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routine is ugly and complex because the C syntax for declarations is ugly
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and complex. This routine is straightforward so long as *no* pointer types,
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array types, or function types are involved.
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In the simple cases, this routine will return the (string) value which was
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passed in as the "ret_val" argument. Usually, this starts out either as an
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empty string, or as the name of the declared item (i.e. the formal function
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parameter variable).
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This routine will also return with the global variable "data_type" set to
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some string value which is the "basic" data-type of the given complete type.
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This "data_type" string can be concatenated onto the front of the returned
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string after this routine returns to its caller.
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In complicated cases involving pointer types, array types, or function
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types, the C declaration syntax requires an "inside out" approach, i.e. if
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you have a type which is a "pointer-to-function" type, you need to handle
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the "pointer" part first, but it also has to be "innermost" (relative to
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the declaration stuff for the "function" type). Thus, is this case, you
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must prepend a "(*" and append a ")" to the name of the item (i.e. formal
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variable). Then you must append and prepend the other info for the
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"function type" part of the overall type.
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To handle the "innermost precedence" rules of complicated C declarators, we
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do the following (in this routine). The input parameter called "ret_val"
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is treated as a "seed". Each time gen_type is called (perhaps recursively)
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some additional strings may be appended or prepended (or both) to the "seed"
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string. If yet another (lower) level of the GCC tree exists for the given
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type (as in the case of a pointer type, an array type, or a function type)
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then the (wrapped) seed is passed to a (recursive) invocation of gen_type()
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this recursive invocation may again "wrap" the (new) seed with yet more
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declarator stuff, by appending, prepending (or both). By the time the
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recursion bottoms out, the "seed value" at that point will have a value
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which is (almost) the complete source version of the declarator (except
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for the data_type info). Thus, this deepest "seed" value is simply passed
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back up through all of the recursive calls until it is given (as the return
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value) to the initial caller of the gen_type() routine. All that remains
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to do at this point is for the initial caller to prepend the "data_type"
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string onto the returned "seed". */
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static const char *
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gen_type (ret_val, t, style)
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const char *ret_val;
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tree t;
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formals_style style;
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{
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tree chain_p;
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/* If there is a typedef name for this type, use it. */
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if (TYPE_NAME (t) && TREE_CODE (TYPE_NAME (t)) == TYPE_DECL)
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data_type = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (t)));
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else
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{
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switch (TREE_CODE (t))
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{
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case POINTER_TYPE:
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if (TYPE_READONLY (t))
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ret_val = concat ("const ", ret_val, NULL);
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if (TYPE_VOLATILE (t))
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ret_val = concat ("volatile ", ret_val, NULL);
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ret_val = concat ("*", ret_val, NULL);
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if (TREE_CODE (TREE_TYPE (t)) == ARRAY_TYPE || TREE_CODE (TREE_TYPE (t)) == FUNCTION_TYPE)
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ret_val = concat ("(", ret_val, ")", NULL);
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ret_val = gen_type (ret_val, TREE_TYPE (t), style);
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return ret_val;
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case ARRAY_TYPE:
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if (!COMPLETE_TYPE_P (t) || TREE_CODE (TYPE_SIZE (t)) != INTEGER_CST)
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ret_val = gen_type (concat (ret_val, "[]", NULL),
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TREE_TYPE (t), style);
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else if (int_size_in_bytes (t) == 0)
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ret_val = gen_type (concat (ret_val, "[0]", NULL),
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TREE_TYPE (t), style);
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else
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{
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int size = (int_size_in_bytes (t) / int_size_in_bytes (TREE_TYPE (t)));
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char buff[10];
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sprintf (buff, "[%d]", size);
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ret_val = gen_type (concat (ret_val, buff, NULL),
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TREE_TYPE (t), style);
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}
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break;
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case FUNCTION_TYPE:
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ret_val = gen_type (concat (ret_val,
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gen_formal_list_for_type (t, style),
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NULL),
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TREE_TYPE (t), style);
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break;
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case IDENTIFIER_NODE:
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data_type = IDENTIFIER_POINTER (t);
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break;
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/* The following three cases are complicated by the fact that a
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user may do something really stupid, like creating a brand new
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"anonymous" type specification in a formal argument list (or as
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part of a function return type specification). For example:
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int f (enum { red, green, blue } color);
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In such cases, we have no name that we can put into the prototype
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to represent the (anonymous) type. Thus, we have to generate the
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whole darn type specification. Yuck! */
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case RECORD_TYPE:
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if (TYPE_NAME (t))
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data_type = IDENTIFIER_POINTER (TYPE_NAME (t));
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else
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{
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data_type = "";
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chain_p = TYPE_FIELDS (t);
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while (chain_p)
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{
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data_type = concat (data_type, gen_decl (chain_p, 0, ansi),
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NULL);
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chain_p = TREE_CHAIN (chain_p);
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data_type = concat (data_type, "; ", NULL);
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}
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data_type = concat ("{ ", data_type, "}", NULL);
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}
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data_type = concat ("struct ", data_type, NULL);
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break;
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case UNION_TYPE:
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if (TYPE_NAME (t))
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data_type = IDENTIFIER_POINTER (TYPE_NAME (t));
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else
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{
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data_type = "";
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chain_p = TYPE_FIELDS (t);
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while (chain_p)
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{
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data_type = concat (data_type, gen_decl (chain_p, 0, ansi),
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NULL);
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chain_p = TREE_CHAIN (chain_p);
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data_type = concat (data_type, "; ", NULL);
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}
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data_type = concat ("{ ", data_type, "}", NULL);
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}
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data_type = concat ("union ", data_type, NULL);
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break;
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case ENUMERAL_TYPE:
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if (TYPE_NAME (t))
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data_type = IDENTIFIER_POINTER (TYPE_NAME (t));
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else
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{
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data_type = "";
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chain_p = TYPE_VALUES (t);
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while (chain_p)
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{
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data_type = concat (data_type,
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IDENTIFIER_POINTER (TREE_PURPOSE (chain_p)), NULL);
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chain_p = TREE_CHAIN (chain_p);
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if (chain_p)
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data_type = concat (data_type, ", ", NULL);
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}
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data_type = concat ("{ ", data_type, " }", NULL);
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}
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data_type = concat ("enum ", data_type, NULL);
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break;
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case TYPE_DECL:
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data_type = IDENTIFIER_POINTER (DECL_NAME (t));
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break;
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case INTEGER_TYPE:
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data_type = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (t)));
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/* Normally, `unsigned' is part of the deal. Not so if it comes
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with a type qualifier. */
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if (TREE_UNSIGNED (t) && TYPE_QUALS (t))
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data_type = concat ("unsigned ", data_type, NULL);
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break;
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case REAL_TYPE:
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data_type = IDENTIFIER_POINTER (DECL_NAME (TYPE_NAME (t)));
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break;
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case VOID_TYPE:
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data_type = "void";
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break;
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case ERROR_MARK:
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data_type = "[ERROR]";
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break;
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default:
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abort ();
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}
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}
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if (TYPE_READONLY (t))
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ret_val = concat ("const ", ret_val, NULL);
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if (TYPE_VOLATILE (t))
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ret_val = concat ("volatile ", ret_val, NULL);
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if (TYPE_RESTRICT (t))
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ret_val = concat ("restrict ", ret_val, NULL);
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return ret_val;
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}
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/* Generate a string (source) representation of an entire entity declaration
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(using some particular style for function types).
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The given entity may be either a variable or a function.
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If the "is_func_definition" parameter is non-zero, assume that the thing
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we are generating a declaration for is a FUNCTION_DECL node which is
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associated with a function definition. In this case, we can assume that
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an attached list of DECL nodes for function formal arguments is present. */
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static const char *
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gen_decl (decl, is_func_definition, style)
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tree decl;
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int is_func_definition;
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formals_style style;
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{
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const char *ret_val;
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if (DECL_NAME (decl))
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||
ret_val = IDENTIFIER_POINTER (DECL_NAME (decl));
|
||
else
|
||
ret_val = "";
|
||
|
||
/* If we are just generating a list of names of formal parameters, we can
|
||
simply return the formal parameter name (with no typing information
|
||
attached to it) now. */
|
||
|
||
if (style == k_and_r_names)
|
||
return ret_val;
|
||
|
||
/* Note that for the declaration of some entity (either a function or a
|
||
data object, like for instance a parameter) if the entity itself was
|
||
declared as either const or volatile, then const and volatile properties
|
||
are associated with just the declaration of the entity, and *not* with
|
||
the `type' of the entity. Thus, for such declared entities, we have to
|
||
generate the qualifiers here. */
|
||
|
||
if (TREE_THIS_VOLATILE (decl))
|
||
ret_val = concat ("volatile ", ret_val, NULL);
|
||
if (TREE_READONLY (decl))
|
||
ret_val = concat ("const ", ret_val, NULL);
|
||
|
||
data_type = "";
|
||
|
||
/* For FUNCTION_DECL nodes, there are two possible cases here. First, if
|
||
this FUNCTION_DECL node was generated from a function "definition", then
|
||
we will have a list of DECL_NODE's, one for each of the function's formal
|
||
parameters. In this case, we can print out not only the types of each
|
||
formal, but also each formal's name. In the second case, this
|
||
FUNCTION_DECL node came from an actual function declaration (and *not*
|
||
a definition). In this case, we do nothing here because the formal
|
||
argument type-list will be output later, when the "type" of the function
|
||
is added to the string we are building. Note that the ANSI-style formal
|
||
parameter list is considered to be a (suffix) part of the "type" of the
|
||
function. */
|
||
|
||
if (TREE_CODE (decl) == FUNCTION_DECL && is_func_definition)
|
||
{
|
||
ret_val = concat (ret_val, gen_formal_list_for_func_def (decl, ansi),
|
||
NULL);
|
||
|
||
/* Since we have already added in the formals list stuff, here we don't
|
||
add the whole "type" of the function we are considering (which
|
||
would include its parameter-list info), rather, we only add in
|
||
the "type" of the "type" of the function, which is really just
|
||
the return-type of the function (and does not include the parameter
|
||
list info). */
|
||
|
||
ret_val = gen_type (ret_val, TREE_TYPE (TREE_TYPE (decl)), style);
|
||
}
|
||
else
|
||
ret_val = gen_type (ret_val, TREE_TYPE (decl), style);
|
||
|
||
ret_val = affix_data_type (ret_val);
|
||
|
||
if (TREE_CODE (decl) != FUNCTION_DECL && DECL_REGISTER (decl))
|
||
ret_val = concat ("register ", ret_val, NULL);
|
||
if (TREE_PUBLIC (decl))
|
||
ret_val = concat ("extern ", ret_val, NULL);
|
||
if (TREE_CODE (decl) == FUNCTION_DECL && !TREE_PUBLIC (decl))
|
||
ret_val = concat ("static ", ret_val, NULL);
|
||
|
||
return ret_val;
|
||
}
|
||
|
||
extern FILE *aux_info_file;
|
||
|
||
/* Generate and write a new line of info to the aux-info (.X) file. This
|
||
routine is called once for each function declaration, and once for each
|
||
function definition (even the implicit ones). */
|
||
|
||
void
|
||
gen_aux_info_record (fndecl, is_definition, is_implicit, is_prototyped)
|
||
tree fndecl;
|
||
int is_definition;
|
||
int is_implicit;
|
||
int is_prototyped;
|
||
{
|
||
if (flag_gen_aux_info)
|
||
{
|
||
static int compiled_from_record = 0;
|
||
|
||
/* Each output .X file must have a header line. Write one now if we
|
||
have not yet done so. */
|
||
|
||
if (! compiled_from_record++)
|
||
{
|
||
/* The first line tells which directory file names are relative to.
|
||
Currently, -aux-info works only for files in the working
|
||
directory, so just use a `.' as a placeholder for now. */
|
||
fprintf (aux_info_file, "/* compiled from: . */\n");
|
||
}
|
||
|
||
/* Write the actual line of auxiliary info. */
|
||
|
||
fprintf (aux_info_file, "/* %s:%d:%c%c */ %s;",
|
||
DECL_SOURCE_FILE (fndecl),
|
||
DECL_SOURCE_LINE (fndecl),
|
||
(is_implicit) ? 'I' : (is_prototyped) ? 'N' : 'O',
|
||
(is_definition) ? 'F' : 'C',
|
||
gen_decl (fndecl, is_definition, ansi));
|
||
|
||
/* If this is an explicit function declaration, we need to also write
|
||
out an old-style (i.e. K&R) function header, just in case the user
|
||
wants to run unprotoize. */
|
||
|
||
if (is_definition)
|
||
{
|
||
fprintf (aux_info_file, " /*%s %s*/",
|
||
gen_formal_list_for_func_def (fndecl, k_and_r_names),
|
||
gen_formal_list_for_func_def (fndecl, k_and_r_decls));
|
||
}
|
||
|
||
fprintf (aux_info_file, "\n");
|
||
}
|
||
}
|