ext/drsyms/drsyms_common.c

/* **********************************************************
 * Copyright (c) 2011 Google, Inc.  All rights reserved.
 * **********************************************************/

/*
 * 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.
 *
 * * Neither the name of VMware, Inc. nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *
 * 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 VMWARE, INC. 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.
 */

/* IR for C/C++ types in drsyms.
 *
 * We try to limit it to what an instrumentation might reasonably need.
 */

#include "dr_api.h"
#include "drsyms.h"
#include "drsyms_private.h"

void
pool_init(mempool_t *pool, char *buf, size_t sz)
{
    pool->base = buf;
    pool->cur = (char*)ALIGN_FORWARD(buf, 8);
    pool->size = sz;
}

void *
pool_alloc(mempool_t *pool, size_t sz)
{
    char *ret;
    char *next;
    /* Maintain 8-byte alignment. */
    next = pool->cur + ALIGN_FORWARD(sz, 8);
    if (next <= pool->base + pool->size) {
        ret = pool->cur;
        pool->cur = next;
    } else {
        ret = NULL;  /* Overflow. */
    }
    return ret;
}