05-05-2011
Quote:
Originally Posted by
kumaran_5555
This will not take memory from heap. This would be allocated from stack because this is a local variable and you aren't using malloc() / any alloc() functions.
Quote:
Originally Posted by
rupeshkp728
hey kumaran in C++ new is used in place of malloc of C and so the memory will be allocated from heap.
I know very little about C++. The following comment is not intended to address the original poster's issue. It's just a brief response to what seems to be a tendency to equate malloc'd memory with the heap.
malloc is not required to allocate from the heap. In fact, quite a few implementations may not do so. Some use mmap exclusively (e.g. OpenBSD). Some may use sbrk for some allocations and mmap for others (e.g. Linux (glibc), FreeBSD).
Where malloc'd memory resides is highly implementation dependent.
Regards,
Alister
These 2 Users Gave Thanks to alister For This Post:
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heap(1) BSD General Commands Manual heap(1)
NAME
heap -- List all the malloc-allocated buffers in the process's heap
SYNOPSIS
heap [-guessNonObjects] [-sumObjectFields] [-showSizes] [-addresses all | <classes-pattern>] [-noContent] pid | partial-executable-name
DESCRIPTION
heap lists the objects currently allocated on the heap of the specified process, as well as summary data. Objects are categorized by class
name, type (Objective-C, C++, or CFType), and binary image. C++ objects are identified by the vtable referenced from the start of the
object, so with multiple inheritance this may not give the precise class of the object.
The binary image identified for a class is the image which implements the class, not necessarily the binary image which caused the objects to
be allocated at runtime, or which "owns" those objects.
heap requires one parameter -- either a process ID or a full or partial executable name.
The following options are available:
-guessNonObjects
Look through the memory contents of each Objective-C object to find pointers to malloc'ed blocks (non-objects), such as the variable
array hanging from an NSArray. These referenced blocks of memory are identified as their offset from the start of the object (say
"__NSCFArray[12]"). The count, number of bytes, and average size of memory blocks referenced from each different object offset loca-
tion are listed in the output.
-sumObjectFields
Do the same analysis as with the -guessNonObjects option, but add the sizes of those referenced non-object fields into the entries
for the corresponding objects.
-showSizes
Show the distribution of each malloc size for each object, instead of summing and averaging the sizes in a single entry.
-addresses all | <classes-pattern>
Print the addresses of all malloc blocks found on the heap in ascending address order, or the addresses of those objects whose full
class name is matched by the regular expression <classes-pattern>. The string "all" indicates that the addresses of all blocks (both
objects and non-objects) should be printed. The <classes-pattern> regular expression is interpreted as an extended (modern) regular
expression as described by the re_format(7) manual page. Note that toll-freed-bridged CoreFoundation and Foundation classes have the
"__NSCF" prefix rather than just "NS" or "CF". Examples of valid classes-patterns include:
__NSCFString
'NS.*'
'__NSCFString|__NSCFArray'
'.*(String|Array)'
non-object
-noContent
Do not show object content in -addresses mode.
SEE ALSO
malloc(3), leaks(1), malloc_history(1), stringdups(1), vmmap(1), DevToolsSecurity(1)
The Xcode developer tools also include Instruments, a graphical application that can give information similar to that provided by heap. The
Allocations instrument graphically displays dynamic, real-time information about the object and memory use in an application, including back-
traces of where the allocations occurred. The Leaks instrument performs memory leak analysis.
BSD
Mar. 16, 2013 BSD