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[/] [openrisc/] [trunk/] [gnu-src/] [gdb-6.8/] [gdb/] [macrotab.h] - Blame information for rev 157

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1 24 jeremybenn
/* Interface to C preprocessor macro tables for GDB.
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   Copyright (C) 2002, 2007, 2008 Free Software Foundation, Inc.
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   Contributed by Red Hat, Inc.
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   This file is part of GDB.
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   This program 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 3 of the License, or
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   (at your option) any later version.
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   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#ifndef MACROTAB_H
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#define MACROTAB_H
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struct obstack;
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struct bcache;
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/* How do we represent a source location?  I mean, how should we
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   represent them within GDB; the user wants to use all sorts of
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   ambiguous abbreviations, like "break 32" and "break foo.c:32"
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   ("foo.c" may have been #included into several compilation units),
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   but what do we disambiguate those things to?
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   - Answer 1: "Filename and line number."  (Or column number, if
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   you're picky.)  That's not quite good enough.  For example, the
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   same source file can be #included into several different
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   compilation units --- which #inclusion do you mean?
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   - Answer 2: "Compilation unit, filename, and line number."  This is
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   a pretty good answer; GDB's `struct symtab_and_line' basically
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   embodies this representation.  But it's still ambiguous; what if a
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   given compilation unit #includes the same file twice --- how can I
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   set a breakpoint on line 12 of the fifth #inclusion of "foo.c"?
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   - Answer 3: "Compilation unit, chain of #inclusions, and line
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   number."  This is analogous to the way GCC reports errors in
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   #include files:
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        $ gcc -c base.c
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        In file included from header2.h:8,
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                         from header1.h:3,
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                         from base.c:5:
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        header3.h:1: parse error before ')' token
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        $
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   GCC tells you exactly what path of #inclusions led you to the
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   problem.  It gives you complete information, in a way that the
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   following would not:
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        $ gcc -c base.c
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        header3.h:1: parse error before ')' token
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        $
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   Converting all of GDB to use this is a big task, and I'm not really
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   suggesting it should be a priority.  But this module's whole
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   purpose is to maintain structures describing the macro expansion
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   process, so I think it's appropriate for us to take a little care
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   to do that in a complete fashion.
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   In this interface, the first line of a file is numbered 1, not 0.
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   This is the same convention the rest of GDB uses.  */
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/* A table of all the macro definitions for a given compilation unit.  */
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struct macro_table;
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/* A source file that participated in a compilation unit --- either a
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   main file, or an #included file.  If a file is #included more than
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   once, the presence of the `included_from' and `included_at_line'
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   members means that we need to make one instance of this structure
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   for each #inclusion.  Taken as a group, these structures form a
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   tree mapping the #inclusions that contributed to the compilation
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   unit, with the main source file as its root.
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   Beware --- not every source file mentioned in a compilation unit's
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   symtab structures will appear in the #inclusion tree!  As of Oct
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   2002, GCC does record the effect of #line directives in the source
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   line info, but not in macro info.  This means that GDB's symtabs
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   (built from the former, among other things) may mention filenames
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   that the #inclusion tree (built from the latter) doesn't have any
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   record of.  See macroscope.c:sal_macro_scope for how to accomodate
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   this.
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   It's worth noting that libcpp has a simpler way of representing all
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   this, which we should consider switching to.  It might even be
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   suitable for ordinary non-macro line number info.
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   Suppose you take your main source file, and after each line
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   containing an #include directive you insert the text of the
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   #included file.  The result is a big file that pretty much
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   corresponds to the full text the compiler's going to see.  There's
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   a one-to-one correspondence between lines in the big file and
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   per-inclusion lines in the source files.  (Obviously, #include
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   directives that are #if'd out don't count.  And you'll need to
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   append a newline to any file that doesn't end in one, to avoid
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   splicing the last #included line with the next line of the
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   #including file.)
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   Libcpp calls line numbers in this big imaginary file "logical line
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   numbers", and has a data structure called a "line map" that can map
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   logical line numbers onto actual source filenames and line numbers,
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   and also tell you the chain of #inclusions responsible for any
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   particular logical line number.  Basically, this means you can pass
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   around a single line number and some kind of "compilation unit"
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   object and you get nice, unambiguous source code locations that
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   distinguish between multiple #inclusions of the same file, etc.
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   Pretty neat, huh?  */
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struct macro_source_file
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{
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  /* The macro table for the compilation unit this source location is
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     a part of.  */
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  struct macro_table *table;
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  /* A source file --- possibly a header file.  */
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  const char *filename;
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  /* The location we were #included from, or zero if we are the
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     compilation unit's main source file.  */
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  struct macro_source_file *included_by;
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  /* If `included_from' is non-zero, the line number in that source
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     file at which we were included.  */
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  int included_at_line;
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  /* Head of a linked list of the source files #included by this file;
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     our children in the #inclusion tree.  This list is sorted by its
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     elements' `included_at_line' values, which are unique.  (The
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     macro splay tree's ordering function needs this property.)  */
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  struct macro_source_file *includes;
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  /* The next file #included by our `included_from' file; our sibling
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     in the #inclusion tree.  */
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  struct macro_source_file *next_included;
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};
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/* Create a new, empty macro table.  Allocate it in OBSTACK, or use
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   xmalloc if OBSTACK is zero.  Use BCACHE to store all macro names,
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   arguments, definitions, and anything else that might be the same
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   amongst compilation units in an executable file; if BCACHE is zero,
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   don't cache these things.
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   Note that, if either OBSTACK or BCACHE are non-zero, then removing
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   information from the table may leak memory.  Neither obstacks nor
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   bcaches really allow you to remove information, so although we can
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   update the data structure to record the change, we can't free the
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   old data.  At the moment, since we only provide obstacks and
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   bcaches for macro tables for symtabs, this isn't a problem; only
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   odd debugging information makes a definition and then deletes it at
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   the same source location (although 'gcc -DFOO -UFOO -DFOO=2' does
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   do that in GCC 4.1.2.).  */
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struct macro_table *new_macro_table (struct obstack *obstack,
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                                     struct bcache *bcache);
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/* Free TABLE, and any macro definitions, source file structures,
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   etc. it owns.  This will raise an internal error if TABLE was
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   allocated on an obstack, or if it uses a bcache.  */
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void free_macro_table (struct macro_table *table);
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/* Set FILENAME as the main source file of TABLE.  Return a source
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   file structure describing that file; if we record the #definition
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   of macros, or the #inclusion of other files into FILENAME, we'll
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   use that source file structure to indicate the context.
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   The "main source file" is the one that was given to the compiler;
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   all other source files that contributed to the compilation unit are
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   #included, directly or indirectly, from this one.
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   The macro table makes its own copy of FILENAME; the caller is
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   responsible for freeing FILENAME when it is no longer needed.  */
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struct macro_source_file *macro_set_main (struct macro_table *table,
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                                          const char *filename);
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/* Return the main source file of the macro table TABLE.  */
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struct macro_source_file *macro_main (struct macro_table *table);
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/* Record a #inclusion.
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   Record in SOURCE's macro table that, at line number LINE in SOURCE,
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   we #included the file INCLUDED.  Return a source file structure we
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   can use for symbols #defined or files #included into that.  If we've
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   already created a source file structure for this #inclusion, return
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   the same structure we created last time.
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   The first line of the source file has a line number of 1, not 0.
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   The macro table makes its own copy of INCLUDED; the caller is
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   responsible for freeing INCLUDED when it is no longer needed.  */
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struct macro_source_file *macro_include (struct macro_source_file *source,
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                                         int line,
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                                         const char *included);
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/* Find any source file structure for a file named NAME, either
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   included into SOURCE, or SOURCE itself.  Return zero if we have
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   none.  NAME is only the final portion of the filename, not the full
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   path.  e.g., `stdio.h', not `/usr/include/stdio.h'.  If NAME
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   appears more than once in the inclusion tree, return the
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   least-nested inclusion --- the one closest to the main source file.  */
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struct macro_source_file *(macro_lookup_inclusion
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                           (struct macro_source_file *source,
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                            const char *name));
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/* Record an object-like #definition (i.e., one with no parameter list).
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   Record in SOURCE's macro table that, at line number LINE in SOURCE,
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   we #defined a preprocessor symbol named NAME, whose replacement
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   string is REPLACEMENT.  This function makes copies of NAME and
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   REPLACEMENT; the caller is responsible for freeing them.  */
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void macro_define_object (struct macro_source_file *source, int line,
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                          const char *name, const char *replacement);
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/* Record an function-like #definition (i.e., one with a parameter list).
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   Record in SOURCE's macro table that, at line number LINE in SOURCE,
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   we #defined a preprocessor symbol named NAME, with ARGC arguments
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   whose names are given in ARGV, whose replacement string is REPLACEMENT.  If
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   the macro takes a variable number of arguments, then ARGC should be
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   one greater than the number of named arguments, and ARGV[ARGC-1]
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   should be the string "...".  This function makes its own copies of
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   NAME, ARGV, and REPLACEMENT; the caller is responsible for freeing
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   them.  */
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void macro_define_function (struct macro_source_file *source, int line,
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                            const char *name, int argc, const char **argv,
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                            const char *replacement);
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/* Record an #undefinition.
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   Record in SOURCE's macro table that, at line number LINE in SOURCE,
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   we removed the definition for the preprocessor symbol named NAME.  */
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void macro_undef (struct macro_source_file *source, int line,
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                  const char *name);
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/* Different kinds of macro definitions.  */
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enum macro_kind
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{
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  macro_object_like,
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  macro_function_like
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};
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/* A preprocessor symbol definition.  */
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struct macro_definition
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{
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  /* The table this definition lives in.  */
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  struct macro_table *table;
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  /* What kind of macro it is.  */
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  enum macro_kind kind;
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  /* If `kind' is `macro_function_like', the number of arguments it
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     takes, and their names.  The names, and the array of pointers to
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     them, are in the table's bcache, if it has one.  */
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  int argc;
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  const char * const *argv;
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  /* The replacement string (body) of the macro.  This is in the
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     table's bcache, if it has one.  */
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  const char *replacement;
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};
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/* Return a pointer to the macro definition for NAME in scope at line
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   number LINE of SOURCE.  If LINE is -1, return the definition in
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   effect at the end of the file.  The macro table owns the structure;
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   the caller need not free it.  Return zero if NAME is not #defined
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   at that point.  */
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struct macro_definition *(macro_lookup_definition
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                          (struct macro_source_file *source,
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                           int line, const char *name));
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/* Return the source location of the definition for NAME in scope at
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   line number LINE of SOURCE.  Set *DEFINITION_LINE to the line
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   number of the definition, and return a source file structure for
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   the file.  Return zero if NAME has no definition in scope at that
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   point, and leave *DEFINITION_LINE unchanged.  */
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struct macro_source_file *(macro_definition_location
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                           (struct macro_source_file *source,
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                            int line,
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                            const char *name,
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                            int *definition_line));
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#endif /* MACROTAB_H */

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