mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-08 19:04:45 +00:00
Add macro to give alignment requirements of a type. (Bug 562844) r=bsmedberg
This commit is contained in:
parent
29a342cd5f
commit
cbeb3a19cd
@ -156,6 +156,22 @@ public:
|
||||
#define NS_ARRAY_LENGTH(array_) \
|
||||
(sizeof(array_)/sizeof(array_[0]))
|
||||
|
||||
/**
|
||||
* A macro, NS_ALIGNMENT_OF(t_) that determines the alignment
|
||||
* requirements of a type.
|
||||
*/
|
||||
namespace mozilla {
|
||||
template <class T>
|
||||
struct AlignmentTestStruct
|
||||
{
|
||||
char c;
|
||||
T t;
|
||||
};
|
||||
}
|
||||
|
||||
#define NS_ALIGNMENT_OF(t_) \
|
||||
(sizeof(mozilla::AlignmentTestStruct<t_>) - sizeof(t_))
|
||||
|
||||
/**
|
||||
* An enumeration type used to represent a method of assignment.
|
||||
*/
|
||||
|
@ -80,6 +80,7 @@ endif
|
||||
SIMPLE_PROGRAMS := $(CPPSRCS:.cpp=$(BIN_SUFFIX))
|
||||
|
||||
CPP_UNIT_TESTS = \
|
||||
ShowAlignments.cpp \
|
||||
ShowSSEConfig.cpp \
|
||||
TestAutoPtr.cpp \
|
||||
TestCOMArray.cpp \
|
||||
|
71
xpcom/tests/ShowAlignments.cpp
Normal file
71
xpcom/tests/ShowAlignments.cpp
Normal file
@ -0,0 +1,71 @@
|
||||
/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
|
||||
/* ***** BEGIN LICENSE BLOCK *****
|
||||
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
||||
*
|
||||
* The contents of this file are subject to the Mozilla Public License Version
|
||||
* 1.1 (the "License"); you may not use this file except in compliance with
|
||||
* the License. You may obtain a copy of the License at
|
||||
* http://www.mozilla.org/MPL/
|
||||
*
|
||||
* Software distributed under the License is distributed on an "AS IS" basis,
|
||||
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
||||
* for the specific language governing rights and limitations under the
|
||||
* License.
|
||||
*
|
||||
* The Original Code is ShowAlignments.cpp.
|
||||
*
|
||||
* The Initial Developer of the Original Code is the Mozilla Foundation.
|
||||
* Portions created by the Initial Developer are Copyright (C) 2010
|
||||
* the Initial Developer. All Rights Reserved.
|
||||
*
|
||||
* Contributor(s):
|
||||
* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation (original author)
|
||||
*
|
||||
* Alternatively, the contents of this file may be used under the terms of
|
||||
* either the GNU General Public License Version 2 or later (the "GPL"), or
|
||||
* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
||||
* in which case the provisions of the GPL or the LGPL are applicable instead
|
||||
* of those above. If you wish to allow use of your version of this file only
|
||||
* under the terms of either the GPL or the LGPL, and not to allow others to
|
||||
* use your version of this file under the terms of the MPL, indicate your
|
||||
* decision by deleting the provisions above and replace them with the notice
|
||||
* and other provisions required by the GPL or the LGPL. If you do not delete
|
||||
* the provisions above, a recipient may use your version of this file under
|
||||
* the terms of any one of the MPL, the GPL or the LGPL.
|
||||
*
|
||||
* ***** END LICENSE BLOCK ***** */
|
||||
|
||||
/* show the size and alignment requirements of various types */
|
||||
|
||||
#include "nsMemory.h"
|
||||
#include <stdio.h>
|
||||
|
||||
struct S {
|
||||
double d;
|
||||
char c;
|
||||
short s;
|
||||
};
|
||||
|
||||
int main()
|
||||
{
|
||||
static const char str[] =
|
||||
"Type %s has size %u and alignment requirement %u\n";
|
||||
#define SHOW_TYPE(t_) \
|
||||
printf(str, #t_, unsigned(sizeof(t_)), unsigned(NS_ALIGNMENT_OF(t_)))
|
||||
|
||||
SHOW_TYPE(char);
|
||||
SHOW_TYPE(unsigned short);
|
||||
SHOW_TYPE(int);
|
||||
SHOW_TYPE(long);
|
||||
SHOW_TYPE(PRUint8);
|
||||
SHOW_TYPE(PRInt16);
|
||||
SHOW_TYPE(PRUint32);
|
||||
SHOW_TYPE(PRFloat64);
|
||||
SHOW_TYPE(void*);
|
||||
SHOW_TYPE(double);
|
||||
SHOW_TYPE(short[7]);
|
||||
SHOW_TYPE(S);
|
||||
SHOW_TYPE(double S::*);
|
||||
|
||||
return 0;
|
||||
}
|
Loading…
Reference in New Issue
Block a user