yasm/plugins/dbg/dbg-objfmt.c

/*
 * Debugging object format (used to debug object format module interface)
 *
 *  Copyright (C) 2001-2007  Peter Johnson
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. 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 AUTHOR AND OTHER 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 AUTHOR OR OTHER 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.
 */
#include <stdio.h>
#include <libyasm.h>

#define N_(String) (String)

typedef struct yasm_objfmt_dbg {
    yasm_objfmt_base objfmt;        /* base structure */

    FILE *dbgfile;
} yasm_objfmt_dbg;

yasm_objfmt_module yasm_dbg_LTX_objfmt;


static yasm_objfmt *
dbg_objfmt_create(yasm_object *object)
{
    yasm_objfmt_dbg *objfmt_dbg = yasm_xmalloc(sizeof(yasm_objfmt_dbg));

    objfmt_dbg->objfmt.module = &yasm_dbg_LTX_objfmt;

    objfmt_dbg->dbgfile = tmpfile();
    if (!objfmt_dbg->dbgfile) {
        fprintf(stderr, N_("could not open temporary file"));
        return 0;
    }
    fprintf(objfmt_dbg->dbgfile, "PLUGIN create()\n");
    return (yasm_objfmt *)objfmt_dbg;
}

static void
dbg_objfmt_output(yasm_object *object, FILE *f, int all_syms,
                  yasm_errwarns *errwarns)
{
    yasm_objfmt_dbg *objfmt_dbg = (yasm_objfmt_dbg *)object->objfmt;
    char buf[1024];
    size_t i;

    /* Copy temp file to real output file */
    rewind(objfmt_dbg->dbgfile);
    while ((i = fread(buf, 1, 1024, objfmt_dbg->dbgfile))) {
        if (fwrite(buf, 1, i, f) != i)
            break;
    }

    /* Reassign objfmt debug file to output file */
    fclose(objfmt_dbg->dbgfile);
    objfmt_dbg->dbgfile = f;

    fprintf(objfmt_dbg->dbgfile, "PLUGIN output(f, object->\n");
    yasm_object_print(object, objfmt_dbg->dbgfile, 1);
    fprintf(objfmt_dbg->dbgfile, "%d)\n", all_syms);
    fprintf(objfmt_dbg->dbgfile, " Symbol Table:\n");
    yasm_symtab_print(object->symtab, objfmt_dbg->dbgfile, 1);
}

static void
dbg_objfmt_destroy(yasm_objfmt *objfmt)
{
    yasm_objfmt_dbg *objfmt_dbg = (yasm_objfmt_dbg *)objfmt;
    fprintf(objfmt_dbg->dbgfile, "PLUGIN destroy()\n");
    yasm_xfree(objfmt);
}

static yasm_section *
dbg_objfmt_add_default_section(yasm_object *object)
{
    yasm_objfmt_dbg *objfmt_dbg = (yasm_objfmt_dbg *)object->objfmt;
    yasm_section *retval;
    int isnew;

    retval = yasm_object_get_general(object, ".text", 0, 0, 0, &isnew, 0);
    if (isnew) {
        fprintf(objfmt_dbg->dbgfile, "(new) ");
        yasm_symtab_define_label(object->symtab, ".text",
            yasm_section_bcs_first(retval), 1, 0);
        yasm_section_set_default(retval, 1);
    }
    return retval;
}

static /*@observer@*/ /*@null@*/ yasm_section *
dbg_objfmt_section_switch(yasm_object *object, yasm_valparamhead *valparams,
                          /*@unused@*/ /*@null@*/
                          yasm_valparamhead *objext_valparams,
                          unsigned long line)
{
    yasm_objfmt_dbg *objfmt_dbg = (yasm_objfmt_dbg *)object->objfmt;
    yasm_valparam *vp;
    yasm_section *retval;
    int isnew;

    fprintf(objfmt_dbg->dbgfile, "PLUGIN section_switch(headp, ");
    yasm_vps_print(valparams, objfmt_dbg->dbgfile);
    fprintf(objfmt_dbg->dbgfile, ", ");
    yasm_vps_print(objext_valparams, objfmt_dbg->dbgfile);
    fprintf(objfmt_dbg->dbgfile, ", %lu), returning ", line);

    vp = yasm_vps_first(valparams);
    if (!yasm_vp_string(vp)) {
        fprintf(objfmt_dbg->dbgfile, "NULL\n");
        return NULL;
    }
    retval = yasm_object_get_general(object, yasm_vp_string(vp), 0, 0, 0,
                                     &isnew, line);
    if (isnew) {
        fprintf(objfmt_dbg->dbgfile, "(new) ");
        yasm_symtab_define_label(object->symtab, vp->val,
                                 yasm_section_bcs_first(retval), 1, line);
    }
    yasm_section_set_default(retval, 0);
    fprintf(objfmt_dbg->dbgfile, "\"%s\" section\n", vp->val);
    return retval;
}

static /*@observer@*/ /*@null@*/ yasm_symrec *
dbg_objfmt_get_special_sym(yasm_object *object, const char *name,
                           const char *parser)
{
    yasm_objfmt_dbg *objfmt_dbg = (yasm_objfmt_dbg *)object->objfmt;
    fprintf(objfmt_dbg->dbgfile,
            "PLUGIN get_special_sym(object, \"%s\", \"%s\")\n",
            name, parser);
    return NULL;
}

/* Define valid debug formats to use with this object format */
static const char *dbg_objfmt_dbgfmt_keywords[] = {
    "null",
    NULL
};

/* Define objfmt structure -- see objfmt.h for details */
yasm_objfmt_module yasm_dbg_LTX_objfmt = {
    "Trace of all info passed to object format module",
    "dbg",
    "dbg",
    32,
    dbg_objfmt_dbgfmt_keywords,
    "null",
    NULL,       /* no directives */
    NULL,       /* no standard macros */
    dbg_objfmt_create,
    dbg_objfmt_output,
    dbg_objfmt_destroy,
    dbg_objfmt_add_default_section,
    dbg_objfmt_section_switch,
    dbg_objfmt_get_special_sym
};