c - What do we have in the bytes beginning at the "Address of a function"?How to know how many bytes to consider? -

-

my brain gets numb imagining this.so bear me if question little wordy.so i've sliced question parts.

1) have @ at bits/bytes starting @ address of function?i mean,at integer variable's address, visualize 4 bytes(for 32 bit systems) of 1's , 0's represent number in binary form.for character variable visualize single byte ascii value of character.for double visualize 8 bytes accordingly.but on earth should visualize @ bytes starting address of function?i know call stack created when function invoked,but function itself?at address have function's expressions,ifs,loops, etc in binary form?are bits/bytes representing function complicated visualize human unlike integers?

2) can use sizeof function?why or why can't we?if have no idea how determine size allocated function, how functions have addresses?as if have addresses,they must have size , since have pointers functions, how determined pointers how many bytes interpret starting pointer address?after can use pointers invoke functions.

please generous details.books , google hasn't been helpful @ in regard.

  1. it can @ all. not required specific.

  2. no. function's address entry point. there's no requirement it, example, occupy consecutive memory locations.

usually, function address actual machine code function begins. there's no reliable way tell function ends. platforms might lay out functions appear in source code, 1 after other. other platforms, particularly ones ipo, won't simple.


Comments

Post a Comment

Popular posts from this blog

Perl - how to grep a block of text from a file -

-
it can in xml or text format. how in general grep block of text in perl? <track type="ws"> <range> <rangestart>0</rangestart> <rangeend>146.912</rangeend> <locationindex>0</locationindex> <propertyindex>0</propertyindex> </range> </track> <track type="ps" id="1"> <range> <rangestart>0</rangestart> <rangeend>146.912</rangeend> <locationindex>1</locationindex> <propertyindex>1</propertyindex> </range> </track> i want grep type="ps" , till </range> . one solution open file, read line line , match block. open(fh, "file.txt"); foreach $line (<fh>) { if ($line =~ m/type="cc"(.*?)<\/range>/) { print $1; } } but there more optimal solution without reading file line l
Read more

delphi - How to remove all the grips on a coolbar if I have several coolbands? -

-
Image
if set mycoolbar.fixedorder true,only grip on first band hidden. well,if use delphi 7 create vcl forms application,then put coolbar on , create 3 coolbans hold other controls,only grip , top coolbands can hidden setting mycoolbar.fixedorder:=true. i've uploaded picture make things clear. you got fixedorder property wrong. fixed property not allow bands rearranged if set true . setting property of coolbar true keep user changing bands order @ runtime, user can still move , resize bands. can give advice can do, actual solution problem, well, have wait answer. my advice use 3 coolbars in row , setting "fixedorder" property true , bandborderstyle bsnone . way grip hidden on of them. about property, it's not bug of ide, actual preference of property.
Read more

javascript - Animating array of divs; only the final element is modified -

-
this baffling me @ moment. i'm experienced programmer looking throw bit of surprise fiancee on countdown page our wedding. desired effect simulated confetti falling behind main page. setup follows: i have array of divs in javascript. each div absolutely positioned on page. have interval set updates every 50 or milliseconds. on each tick, run loop on array of divs, , calculations , update positions. problem problem having, however, though can see divs created, stored array, , modified (in case, each has slight randomized rotation) during initialization phase, once tick update position starts, div stored in whatever last slot of array gets position updated. tried hard-coding each div index testing purposes, strictly last element update position. upon printing current "left" , "top" style values each div before , after calculations shows value has been changed, no visible change noticeable. here's basic code: javascript var container;
Read more