view lwcc/cpp.h @ 577:e49d24f4a9a5

Correct bug in the object file output code leading to stack corruption It turns out leaving a pointer to a stack allocated temporary in a persistent data structure is not conducive to correct program operation. Undo the export check setup in the object file output sequence so a pointer to stack allocated memory is not left hanging when the function returns. This seems to correct at least one mysterious crash bug, and possibly others. Thanks to Boisy Pitre for reporting the crash bug that led to this discovery, as well as a previous crash bug that likely has the same root cause. Additional thanks to Ciaran Anscomb whose debugger wielding wizardry revealed the exact location of this particular bit of unbrilliance.
author William Astle <lost@l-w.ca>
date Sat, 03 Aug 2024 14:30:06 -0600
parents 670ea8f90212
children
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/*
lwcc/cpp.h

Copyright © 2013 William Astle

This file is part of LWTOOLS.

LWTOOLS is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later
version.

This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
more details.

You should have received a copy of the GNU General Public License along with
this program. If not, see <http://www.gnu.org/licenses/>.
*/

#ifndef cpp_h_seen___
#define cpp_h_seen___

#include <stdio.h>

#include <lw_stringlist.h>

//#include "symbol.h"
#include "token.h"

#define TOKBUFSIZE 32

struct expand_e
{
	struct expand_e *next;
	struct symtab_e *s;		// symbol table entry of the expanding symbol
};

struct preproc_info
{
	const char *fn;
	FILE *fp;
	struct token *tokqueue;
	struct token *curtok;
	void (*errorcb)(const char *);
	void (*warningcb)(const char *);
	int eolstate;			// internal for use in handling newlines
	int lineno;				// the current input line number
	int column;				// the current input column
	int trigraphs;			// nonzero if we're going to handle trigraphs
	int ra;
	int qseen;
	int ungetbufl;
	int ungetbufs;
	int *ungetbuf;
	int unget;
	int eolseen;
	int nlseen;
	int ppeolseen;			// nonzero if we've seen only whitespace (or nothing) since a newline
	int skip_level;			// nonzero if we're in a false conditional
	int found_level;		// nonzero if we're in a true conditional
	int else_level;			// for counting #else directives
	int else_skip_level;	// ditto
	struct symtab_e *sh;	// the preprocessor's symbol table
	struct token *sourcelist;	// for expanding a list of tokens
	struct expand_e *expand_list;	// record of which macros are currently being expanded
	char *lexstr;			// for lexing a string (token pasting)
	int lexstrloc;			// ditto
	struct preproc_info *n;	// next in file stack
	struct preproc_info *filestack;	// stack of saved files during include
	struct lw_strpool *strpool;
	lw_stringlist_t quotelist;
	lw_stringlist_t inclist;
};

extern struct preproc_info *preproc_init(const char *);
extern struct token *preproc_next_token(struct preproc_info *);
extern struct token *preproc_next_processed_token(struct preproc_info *);
extern void preproc_finish(struct preproc_info *);
extern void preproc_register_error_callback(struct preproc_info *, void (*)(const char *));
extern void preproc_register_warning_callback(struct preproc_info *, void (*)(const char *));
extern void preproc_throw_error(struct preproc_info *, const char *, ...);
extern void preproc_throw_warning(struct preproc_info *, const char *, ...);
extern void preproc_unget_token(struct preproc_info *, struct token *);
extern void preproc_add_include(struct preproc_info *, char *, int);
extern void preproc_add_macro(struct preproc_info *, char *);
extern struct token *preproc_next(struct preproc_info *);

#endif // cpp_h_seen___