/* Interface to C preprocessor macro tables for GDB.
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/* Interface to C preprocessor macro tables for GDB.
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Copyright (C) 2002, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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Copyright (C) 2002, 2007, 2008, 2009, 2010 Free Software Foundation, Inc.
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Contributed by Red Hat, 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 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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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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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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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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(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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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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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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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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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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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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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#ifndef MACROTAB_H
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#ifndef MACROTAB_H
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#define MACROTAB_H
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#define MACROTAB_H
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struct obstack;
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struct obstack;
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struct bcache;
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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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/* 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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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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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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("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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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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- 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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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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same source file can be #included into several different
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compilation units --- which #inclusion do you mean?
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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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- 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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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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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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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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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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- 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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number." This is analogous to the way GCC reports errors in
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#include files:
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#include files:
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$ gcc -c base.c
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$ gcc -c base.c
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In file included from header2.h:8,
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In file included from header2.h:8,
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from header1.h:3,
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from header1.h:3,
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from base.c:5:
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from base.c:5:
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header3.h:1: parse error before ')' token
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header3.h:1: parse error before ')' token
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$
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$
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GCC tells you exactly what path of #inclusions led you to the
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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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problem. It gives you complete information, in a way that the
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following would not:
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following would not:
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$ gcc -c base.c
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$ gcc -c base.c
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header3.h:1: parse error before ')' token
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header3.h:1: parse error before ')' token
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$
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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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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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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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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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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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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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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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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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/* A table of all the macro definitions for a given compilation unit. */
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struct macro_table;
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struct macro_table;
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/* The definition of a single macro. */
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/* The definition of a single macro. */
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struct macro_definition;
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struct macro_definition;
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/* A source file that participated in a compilation unit --- either a
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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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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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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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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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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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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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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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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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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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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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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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(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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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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record of. See macroscope.c:sal_macro_scope for how to accomodate
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this.
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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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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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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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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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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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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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#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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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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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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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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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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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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splicing the last #included line with the next line of the
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#including file.)
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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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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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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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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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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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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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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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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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distinguish between multiple #inclusions of the same file, etc.
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Pretty neat, huh? */
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Pretty neat, huh? */
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struct macro_source_file
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struct macro_source_file
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{
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{
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/* The macro table for the compilation unit this source location is
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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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a part of. */
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struct macro_table *table;
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struct macro_table *table;
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/* A source file --- possibly a header file. */
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/* A source file --- possibly a header file. */
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const char *filename;
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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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/* 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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compilation unit's main source file. */
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struct macro_source_file *included_by;
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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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/* 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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file at which we were included. */
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int included_at_line;
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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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/* 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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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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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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macro splay tree's ordering function needs this property.) */
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struct macro_source_file *includes;
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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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/* The next file #included by our `included_from' file; our sibling
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in the #inclusion tree. */
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in the #inclusion tree. */
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struct macro_source_file *next_included;
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struct macro_source_file *next_included;
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};
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};
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/* Create a new, empty macro table. Allocate it in OBSTACK, or use
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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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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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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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amongst compilation units in an executable file; if BCACHE is zero,
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don't cache these things.
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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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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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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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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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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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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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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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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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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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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 macro_table *new_macro_table (struct obstack *obstack,
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struct bcache *bcache);
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struct bcache *bcache);
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/* Free TABLE, and any macro definitions, source file structures,
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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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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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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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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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/* 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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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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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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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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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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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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#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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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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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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struct macro_source_file *macro_set_main (struct macro_table *table,
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const char *filename);
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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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/* 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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struct macro_source_file *macro_main (struct macro_table *table);
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/* Mark the macro table TABLE so that macros defined in this table can
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/* Mark the macro table TABLE so that macros defined in this table can
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be redefined without error. Note that it invalid to call this if
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be redefined without error. Note that it invalid to call this if
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TABLE is allocated on an obstack. */
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TABLE is allocated on an obstack. */
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void macro_allow_redefinitions (struct macro_table *table);
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void macro_allow_redefinitions (struct macro_table *table);
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/* Record a #inclusion.
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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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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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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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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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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 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 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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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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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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struct macro_source_file *macro_include (struct macro_source_file *source,
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int line,
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int line,
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const char *included);
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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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/* 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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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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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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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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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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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 *(macro_lookup_inclusion
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(struct macro_source_file *source,
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(struct macro_source_file *source,
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const char *name));
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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 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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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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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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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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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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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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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 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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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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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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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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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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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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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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NAME, ARGV, and REPLACEMENT; the caller is responsible for freeing
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them. */
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them. */
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void macro_define_function (struct macro_source_file *source, int line,
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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 *name, int argc, const char **argv,
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const char *replacement);
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const char *replacement);
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/* Record an #undefinition.
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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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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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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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void macro_undef (struct macro_source_file *source, int line,
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const char *name);
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const char *name);
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/* Different kinds of macro definitions. */
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/* Different kinds of macro definitions. */
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enum macro_kind
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enum macro_kind
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{
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{
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macro_object_like,
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macro_object_like,
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macro_function_like
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macro_function_like
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};
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};
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/* A preprocessor symbol definition. */
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/* A preprocessor symbol definition. */
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struct macro_definition
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struct macro_definition
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{
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{
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/* The table this definition lives in. */
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/* The table this definition lives in. */
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struct macro_table *table;
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struct macro_table *table;
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/* What kind of macro it is. */
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/* What kind of macro it is. */
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ENUM_BITFIELD (macro_kind) kind : 1;
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ENUM_BITFIELD (macro_kind) kind : 1;
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/* If `kind' is `macro_function_like', the number of arguments it
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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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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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them, are in the table's bcache, if it has one. */
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int argc : 31;
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int argc : 31;
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const char * const *argv;
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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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/* 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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table's bcache, if it has one. */
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const char *replacement;
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const char *replacement;
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};
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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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/* 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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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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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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the caller need not free it. Return zero if NAME is not #defined
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at that point. */
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at that point. */
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struct macro_definition *(macro_lookup_definition
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struct macro_definition *(macro_lookup_definition
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(struct macro_source_file *source,
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(struct macro_source_file *source,
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int line, const char *name));
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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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/* 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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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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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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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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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 *(macro_definition_location
|
(struct macro_source_file *source,
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(struct macro_source_file *source,
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int line,
|
int line,
|
const char *name,
|
const char *name,
|
int *definition_line));
|
int *definition_line));
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|
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/* Callback function when walking a macro table. NAME is the name of
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/* Callback function when walking a macro table. NAME is the name of
|
the macro, and DEFINITION is the definition. USER_DATA is an
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the macro, and DEFINITION is the definition. USER_DATA is an
|
arbitrary pointer which is passed by the caller to macro_for_each
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arbitrary pointer which is passed by the caller to macro_for_each
|
or macro_for_each_in_scope. */
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or macro_for_each_in_scope. */
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typedef void (*macro_callback_fn) (const char *name,
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typedef void (*macro_callback_fn) (const char *name,
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const struct macro_definition *definition,
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const struct macro_definition *definition,
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void *user_data);
|
void *user_data);
|
|
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/* Call the function FN for each macro in the macro table TABLE.
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/* Call the function FN for each macro in the macro table TABLE.
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USER_DATA is passed, untranslated, to FN. */
|
USER_DATA is passed, untranslated, to FN. */
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void macro_for_each (struct macro_table *table, macro_callback_fn fn,
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void macro_for_each (struct macro_table *table, macro_callback_fn fn,
|
void *user_data);
|
void *user_data);
|
|
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/* Call the function FN for each macro that is visible in a given
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/* Call the function FN for each macro that is visible in a given
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scope. The scope is represented by FILE and LINE. USER_DATA is
|
scope. The scope is represented by FILE and LINE. USER_DATA is
|
passed, untranslated, to FN. */
|
passed, untranslated, to FN. */
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void macro_for_each_in_scope (struct macro_source_file *file, int line,
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void macro_for_each_in_scope (struct macro_source_file *file, int line,
|
macro_callback_fn fn,
|
macro_callback_fn fn,
|
void *user_data);
|
void *user_data);
|
|
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|
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#endif /* MACROTAB_H */
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#endif /* MACROTAB_H */
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