convert: remove unnecessary/unused opal_size2int() function
The comments in the file even said "This file will hopefully not last long in the tree...".
Этот коммит содержится в:
Jeff Squyres
родитель
4e318c9df1
Коммит
9d7171e8f1
@ -9,7 +9,7 @@
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# University of Stuttgart. All rights reserved.
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# Copyright (c) 2004-2005 The Regents of the University of California.
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# All rights reserved.
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# Copyright (c) 2007-2010 Cisco Systems, Inc. All rights reserved.
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# Copyright (c) 2007-2015 Cisco Systems, Inc. All rights reserved.
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# Copyright (c) 2013 NVIDIA Corporation. All rights reserved.
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# Copyright (c) 2013 Intel, Inc. All rights reserved
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# $COPYRIGHT$
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@ -40,7 +40,6 @@ headers = \
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bit_ops.h \
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cmd_line.h \
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crc.h \
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convert.h \
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daemon_init.h \
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error.h \
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few.h \
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@ -78,7 +77,6 @@ libopalutil_la_SOURCES = \
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basename.c \
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cmd_line.c \
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crc.c \
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convert.c \
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daemon_init.c \
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error.c \
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few.c \
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@ -1,112 +0,0 @@
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/*
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* Copyright (c) 2004-2005 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2006 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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#include "opal_config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include "opal/util/convert.h"
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#include "opal/constants.h"
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#if SIZEOF_SIZE_T <= SIZEOF_INT
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/*
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* This is the [short] case where we can just cast and we're all good
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*/
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int opal_size2int(size_t in, int *out, bool want_check)
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{
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*out = (int)in;
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return OPAL_SUCCESS;
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}
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#else
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/*
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* The rest of the file handles the case where
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* sizeof(size_t)>sizeof(int).
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*/
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static bool init_done = false;
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static unsigned int int_pos = 0;
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static void opal_size2int_init(void);
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static void warn(void);
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int opal_size2int(size_t in, int *out, bool want_check)
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{
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int *pos = (int *) ∈
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unsigned int i;
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if (!init_done) {
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opal_size2int_init();
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}
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*out = pos[int_pos];
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if (want_check) {
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/* Remember that size_t is unsigned, so we don't need to check
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for when in < 0 (in which case the internal checks would be
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slightly different) */
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for (i = 0; i < (sizeof(in) / sizeof(*out)); ++i) {
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if (i != int_pos) {
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if (pos[i] != 0) {
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warn();
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return OPAL_ERR_NOT_IMPLEMENTED;
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}
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}
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}
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}
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return OPAL_SUCCESS;
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}
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static void opal_size2int_init(void)
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{
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size_t bogus = 1;
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int *i = (int *) &bogus;
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for (int_pos = 0; int_pos < (sizeof(bogus) / sizeof(int)); ++int_pos) {
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if (i[int_pos] == 1) {
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break;
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}
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}
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init_done = true;
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}
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static void warn(void)
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{
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#if OPAL_ENABLE_DEBUG
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/* Developer builds */
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fprintf(stderr, "WARNING: A size_t value was attempted to be cast to an int (sizeof(size_t) == %ld, sizeof(int) == %ld), but data was lost in the conversion. This should never happen (i.e., we should never try to convert a value that will be 'too big'). Since this is a developer build, I'm going to abort, and you can check the corefile. Enjoy.\n", (long) sizeof(size_t), (long) sizeof(int));
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abort();
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#else
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static bool warned = false;
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if (!warned) {
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fprintf(stderr, "Open MPI WARNING: A bad cast (size_t->int) occurred.\n");
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fprintf(stderr, "Please inform the Open MPI developers. This message will not repeat.\n");
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fprintf(stderr, "Attempting to continue (no guarantees about correctness...\n");
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warned = true;
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}
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#endif
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}
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#endif
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@ -1,78 +0,0 @@
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/*
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* Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
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* University Research and Technology
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* Corporation. All rights reserved.
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* Copyright (c) 2004-2006 The University of Tennessee and The University
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* of Tennessee Research Foundation. All rights
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* reserved.
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* Copyright (c) 2004-2005 High Performance Computing Center Stuttgart,
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* University of Stuttgart. All rights reserved.
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* Copyright (c) 2004-2005 The Regents of the University of California.
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* All rights reserved.
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* $COPYRIGHT$
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*
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* Additional copyrights may follow
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*
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* $HEADER$
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*/
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/**
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* @file
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*
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* This file will hopefully not last long in the tree, but it's
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* unfortunately necessary for now.
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*
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* There are multiple places in the code base where we need to safely
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* convert from a size_t to an int. However, on some platforms,
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* sizeof(size_t) is larger than sizeof(int), so casting from size_t
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* -> int will result in a compiler warning and potentially data
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* truncation.
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*
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* But, unfortunately, we still need to do it. But we definitely do
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* not want compiler warnings. So when sizeof(size_t)>sizeof(int),
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* the solution is the treat the size_t value like an array and
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* dereference the appropriate nibble and cast that to an int (which
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* accounts for both big and little endian machines).
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*
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* Most places in the code where this casting must occur are because
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* collision of APIs (e.g., one API requires a size_t and another API
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* requires an int. And in most places, we're not going to overflow
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* the int when casting down into it (e.g., it's the result of a
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* strlen -- if that buffer is larger than MAX_INT, we've got other problems!).
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*
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* BUT -- the whole premise of casting down to an int is dangerous.
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* So we provide extra protection here to detect overflow situations
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* and print out appropriate warnings. So if this situation ever
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* occurs, we'll still overflow, but we'll have a good indication that
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* it's happening, and where.
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*/
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#ifndef OPAL_CONVERT_H
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#define OPAL_CONVERT_H
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#include "opal_config.h"
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BEGIN_C_DECLS
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/**
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* Convert a size_t to an int.
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*
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* @param in The size_t value to be converted
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* @param out The output int value.
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* @param want_check Whether to check for truncation or not
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*
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* @returns OPAL_SUCESS If all went well
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* @returns OPAL_NOT_SUPPORTED if the size_t value was truncated
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*
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* The conversion will always occur. However, if the size_t value was
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* truncated (i.e., sizeof(size_t) > sizeof(int), and the cast down to
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* the int actually changed the value), OPAL_NOT_SUPPORTED will be
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* returned.
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*
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* On platforms where sizeof(size_t) <= sizeof(int), this function
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* will aways return OPAL_SUCCESS.
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*/
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OPAL_DECLSPEC int opal_size2int(size_t in, int *out, bool want_check) __opal_attribute_nonnull__(2);
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END_C_DECLS
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#endif
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