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8960e1bc83
"compiler.h" already includes a bunch of common include files. There is absolutely no reason to duplicate them in individual files, and in fact it robs us of central control of how these files are used. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
289 lines
9.3 KiB
C
289 lines
9.3 KiB
C
/* ----------------------------------------------------------------------- *
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*
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* Copyright 1996-2018 The NASM Authors - All Rights Reserved
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* See the file AUTHORS included with the NASM distribution for
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* the specific copyright holders.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following
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* conditions are met:
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*
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* * Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* * Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials provided
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* with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND
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* CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES,
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* INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
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* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*
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* ----------------------------------------------------------------------- */
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/*
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* Parse and handle [pragma] directives. The preprocessor handles
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* %pragma preproc directives separately, all other namespaces are
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* simply converted to [pragma].
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*/
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#include "compiler.h"
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#include "nctype.h"
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#include "nasm.h"
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#include "nasmlib.h"
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#include "assemble.h"
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#include "error.h"
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static enum directive_result output_pragma(const struct pragma *pragma);
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static enum directive_result limit_pragma(const struct pragma *pragma);
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/*
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* Handle [pragma] directives. [pragma] is generally produced by
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* the %pragma preprocessor directive, which simply passes on any
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* string that it finds *except* %pragma preproc. The idea is
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* that pragmas are of the form:
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*
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* %pragma <facility> <opname> [<options>...]
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*
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* ... where "facility" can be either a generic facility or a backend
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* name.
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*
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* The following names are currently reserved for global facilities;
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* so far none of these have any defined pragmas at all:
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*
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* preproc - preprocessor
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* limit - limit setting
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* asm - assembler
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* list - listing generator
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* file - generic file handling
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* input - input file handling
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* output - backend-independent output handling
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* debug - backend-independent debug handling
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* ignore - dummy pragma (can be used to "comment out")
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*
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* This function should generally not error out if it doesn't understand
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* what a pragma is for, for unknown arguments, etc; the whole point of
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* a pragma is that future releases might add new ones that should be
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* ignored rather than be an error. Erroring out is acceptable for
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* known pragmas suffering from parsing errors and so on.
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*
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* Adding default-suppressed warnings would, however, be a good idea
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* at some point.
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*/
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static struct pragma_facility global_pragmas[] =
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{
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{ "asm", NULL },
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{ "limit", limit_pragma },
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{ "list", NULL },
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{ "file", NULL },
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{ "input", NULL },
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/* None of these should actually happen due to special handling */
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{ "preproc", NULL }, /* Handled in the preprocessor by necessity */
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{ "output", NULL },
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{ "debug", NULL },
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{ "ignore", NULL },
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{ NULL, NULL }
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};
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/*
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* Search a pragma list for a known pragma facility and if so, invoke
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* the handler. Return true if processing is complete.
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* The "default name", if set, matches the final NULL entry (used
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* for backends, so multiple backends can share the same list under
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* some circumstances.)
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*/
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static bool search_pragma_list(const struct pragma_facility *list,
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const char *default_name,
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pragma_handler generic_handler,
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struct pragma *pragma)
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{
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const struct pragma_facility *pf;
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enum directive_result rv;
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if (!list)
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return false;
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for (pf = list; pf->name; pf++) {
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if (!nasm_stricmp(pragma->facility_name, pf->name))
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goto found_it;
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}
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if (default_name && !nasm_stricmp(pragma->facility_name, default_name))
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goto found_it;
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return false;
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found_it:
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pragma->facility = pf;
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/* If the handler is NULL all pragmas are unknown... */
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if (pf->handler)
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rv = pf->handler(pragma);
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else
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rv = DIRR_UNKNOWN;
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/* Is there an additional, applicable generic handler? */
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if (rv == DIRR_UNKNOWN && generic_handler)
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rv = generic_handler(pragma);
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switch (rv) {
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case DIRR_UNKNOWN:
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switch (pragma->opcode) {
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case D_none:
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/*!
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*!bad-pragma [off] empty or malformed %pragma
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*! warns about a malformed or otherwise unparsable
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*! \c{%pragma} directive.
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*/
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nasm_error(ERR_WARNING|ERR_PASS2|WARN_BAD_PRAGMA,
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"empty %%pragma %s", pragma->facility_name);
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break;
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default:
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/*!
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*!unknown-pragma [off] unknown %pragma facility or directive
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*! warns about an unknown \c{%pragma} directive.
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*! This is not yet implemented for most cases.
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*/
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nasm_error(ERR_WARNING|ERR_PASS2|WARN_UNKNOWN_PRAGMA,
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"unknown %%pragma %s %s",
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pragma->facility_name, pragma->opname);
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break;
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}
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break;
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case DIRR_OK:
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case DIRR_ERROR:
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break; /* Nothing to do */
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case DIRR_BADPARAM:
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/*
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* This one is an error. Don't use it if forward compatibility
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* would be compromised, as opposed to an inherent error.
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*/
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nasm_error(ERR_NONFATAL, "bad argument to %%pragma %s %s",
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pragma->facility_name, pragma->opname);
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break;
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default:
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panic();
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}
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return true;
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}
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/* This warning message is intended for future use */
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/*!
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*!not-my-pragma [off] %pragma not applicable to this compilation
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*! warns about a \c{%pragma} directive which is not applicable to
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*! this particular assembly session. This is not yet implemented.
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*/
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void process_pragma(char *str)
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{
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struct pragma pragma;
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char *p;
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nasm_zero(pragma);
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pragma.facility_name = nasm_get_word(str, &p);
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if (!pragma.facility_name) {
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nasm_error(ERR_WARNING|ERR_PASS2|WARN_BAD_PRAGMA,
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"empty pragma directive");
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return; /* Empty pragma */
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}
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/*
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* The facility "ignore" means just that; don't even complain of
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* the absence of an operation.
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*/
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if (!nasm_stricmp(pragma.facility_name, "ignore"))
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return;
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/*
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* The "output" and "debug" facilities are aliases for the
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* current output and debug formats, respectively.
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*/
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if (!nasm_stricmp(pragma.facility_name, "output"))
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pragma.facility_name = ofmt->shortname;
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if (!nasm_stricmp(pragma.facility_name, "debug"))
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pragma.facility_name = dfmt->shortname;
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pragma.opname = nasm_get_word(p, &p);
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if (!pragma.opname)
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pragma.opcode = D_none;
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else
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pragma.opcode = directive_find(pragma.opname);
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pragma.tail = nasm_trim_spaces(p);
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/* Look for a global pragma namespace */
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if (search_pragma_list(global_pragmas, NULL, NULL, &pragma))
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return;
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/* Look to see if it is an output backend pragma */
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if (search_pragma_list(ofmt->pragmas, ofmt->shortname,
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output_pragma, &pragma))
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return;
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/* Look to see if it is a debug format pragma */
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if (search_pragma_list(dfmt->pragmas, dfmt->shortname, NULL, &pragma))
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return;
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/*
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* Note: it would be nice to warn for an unknown namespace,
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* but in order to do so we need to walk *ALL* the backends
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* in order to make sure we aren't dealing with a pragma that
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* is for another backend. On the other hand, that could
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* also be a warning with a separate warning flag.
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*
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* Leave this for the future, however, the warning classes are
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* already defined for future compatibility.
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*/
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}
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/*
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* Generic pragmas that apply to all output backends; these are handled
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* specially so they can be made selective based on the output format.
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*/
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static enum directive_result output_pragma(const struct pragma *pragma)
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{
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switch (pragma->opcode) {
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case D_PREFIX:
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case D_GPREFIX:
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set_label_mangle(LM_GPREFIX, pragma->tail);
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return DIRR_OK;
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case D_SUFFIX:
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case D_GSUFFIX:
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set_label_mangle(LM_GSUFFIX, pragma->tail);
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return DIRR_OK;
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case D_LPREFIX:
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set_label_mangle(LM_LPREFIX, pragma->tail);
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return DIRR_OK;
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case D_LSUFFIX:
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set_label_mangle(LM_LSUFFIX, pragma->tail);
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return DIRR_OK;
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default:
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return DIRR_UNKNOWN;
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}
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}
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/*
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* %pragma limit to set resource limits
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*/
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static enum directive_result limit_pragma(const struct pragma *pragma)
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{
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return nasm_set_limit(pragma->opname, pragma->tail);
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}
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