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diff nasmbuild/nasm-2.13rc9/asm/pragma.c @ 10554:587a0a262d22
<moonythedwarf> ` cd nasmbuild; tar -xf nasm.tar.gz
author | HackBot |
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date | Thu, 30 Mar 2017 20:58:41 +0000 |
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--- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/nasmbuild/nasm-2.13rc9/asm/pragma.c Thu Mar 30 20:58:41 2017 +0000 @@ -0,0 +1,218 @@ +/* ----------------------------------------------------------------------- * + * + * Copyright 1996-2017 The NASM Authors - All Rights Reserved + * See the file AUTHORS included with the NASM distribution for + * the specific copyright holders. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following + * conditions are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above + * copyright notice, this list of conditions and the following + * disclaimer in the documentation and/or other materials provided + * with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND + * CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, + * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; + * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN + * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR + * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, + * EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + * ----------------------------------------------------------------------- */ + +/* + * Parse and handle [pragma] directives. The preprocessor handles + * %pragma preproc directives separately, all other namespaces are + * simply converted to [pragma]. + */ + +#include "compiler.h" + +#include <stdlib.h> +#include <string.h> +#include <ctype.h> +#include <limits.h> + +#include "nasm.h" +#include "nasmlib.h" +#include "assemble.h" +#include "error.h" + +/* + * Handle [pragma] directives. [pragma] is generally produced by + * the %pragma preprocessor directive, which simply passes on any + * string that it finds *except* %pragma preproc. The idea is + * that pragmas are of the form: + * + * %pragma <facility> <opname> [<options>...] + * + * ... where "facility" can be either a generic facility or a backend + * name. + * + * The following names are currently reserved for global facilities; + * so far none of these have any defined pragmas at all: + * + * preproc - preprocessor + * asm - assembler + * list - listing generator + * file - generic file handling + * input - input file handling + * output - backend-independent output handling + * debug - backend-independent debug handling + * ignore - dummy pragma (can be used to "comment out") + * + * This function should generally not error out if it doesn't understand + * what a pragma is for, for unknown arguments, etc; the whole point of + * a pragma is that future releases might add new ones that should be + * ignored rather than be an error. Erroring out is acceptable for + * known pragmas suffering from parsing errors and so on. + * + * Adding default-suppressed warnings would, however, be a good idea + * at some point. + */ +static struct pragma_facility global_pragmas[] = +{ + { "preproc", NULL }, /* This shouldn't happen... */ + { "asm", NULL }, + { "list", NULL }, + { "file", NULL }, + { "input", NULL }, + { "output", NULL }, + { "debug", NULL }, + { "ignore", NULL }, + { NULL, NULL } +}; + +/* + * Search a pragma list for a known pragma facility and if so, invoke + * the handler. Return true if processing is complete. + * The "default name", if set, matches the final NULL entry (used + * for backends, so multiple backends can share the same list under + * some circumstances.) + */ +static bool search_pragma_list(const struct pragma_facility *list, + const char *default_name, + struct pragma *pragma) +{ + const struct pragma_facility *pf; + enum directive_result rv; + + if (!list) + return false; + + for (pf = list; pf->name; pf++) { + if (!nasm_stricmp(pragma->facility_name, pf->name)) + goto found_it; + } + + if (default_name && !nasm_stricmp(pragma->facility_name, default_name)) + goto found_it; + + return false; + +found_it: + pragma->facility = pf; + + /* If the handler is NULL all pragmas are unknown... */ + if (pf->handler) + rv = pf->handler(pragma); + else + rv = DIRR_UNKNOWN; + + switch (rv) { + case DIRR_UNKNOWN: + switch (pragma->opcode) { + case D_none: + nasm_error(ERR_WARNING|ERR_PASS2|ERR_WARN_BAD_PRAGMA, + "empty %%pragma %s", pragma->facility_name); + break; + default: + nasm_error(ERR_WARNING|ERR_PASS2|ERR_WARN_UNKNOWN_PRAGMA, + "unknown %%pragma %s %s", + pragma->facility_name, pragma->opname); + break; + } + break; + + case DIRR_OK: + case DIRR_ERROR: + break; /* Nothing to do */ + + case DIRR_BADPARAM: + /* + * This one is an error. Don't use it if forward compatibility + * would be compromised, as opposed to an inherent error. + */ + nasm_error(ERR_NONFATAL, "bad argument to %%pragma %s %s", + pragma->facility_name, pragma->opname); + break; + + default: + panic(); + } + return true; +} + +void process_pragma(char *str) +{ + struct pragma pragma; + char *p; + + nasm_zero(&pragma); + + pragma.facility_name = nasm_get_word(str, &p); + if (!pragma.facility_name) { + nasm_error(ERR_WARNING|ERR_PASS2|ERR_WARN_BAD_PRAGMA, + "empty pragma directive"); + return; /* Empty pragma */ + } + + /* + * The facility "ignore" means just that; don't even complain of + * the absence of an operation. + */ + if (!nasm_stricmp(pragma.facility_name, "ignore")) + return; + + pragma.opname = nasm_get_word(p, &p); + if (!pragma.opname) + pragma.opcode = D_none; + else + pragma.opcode = find_directive(pragma.opname); + + pragma.tail = nasm_skip_spaces(p); + + /* Look for a global pragma namespace */ + if (search_pragma_list(global_pragmas, NULL, &pragma)) + return; + + /* Look to see if it is an output backend pragma */ + if (search_pragma_list(ofmt->pragmas, ofmt->shortname, &pragma)) + return; + + /* Look to see if it is a debug format pragma */ + if (search_pragma_list(dfmt->pragmas, dfmt->shortname, &pragma)) + return; + + /* + * Note: it would be nice to warn for an unknown namespace, + * but in order to do so we need to walk *ALL* the backends + * in order to make sure we aren't dealing with a pragma that + * is for another backend. On the other hand, that could + * also be a warning with a separate warning flag. + * + * Leave this for the future, however, the warning classes are + * already defined for future compatibility. + */ +}