Pseudo-code to illustrate the breakpoint in a program, Programming Languages

Assignment Help:

The standard way for debuggers to plant interactive breakpoints in a program in RAM (whatever the processor instruction set) is to save the break pointed instruction and replace it by a jump to the breakpoint handling code. After the breakpoint is triggered, the saved instruction is restored in its original place in the code. If the interactive dialogue with the debugger during the breakpoint handling indicates that that the triggered breakpoint is to be removed, execution of the program can be resumed simply by jumping to the instruction that had been break pointed. However, if the dialogue with the debugger indicates that the breakpoint is to remain in place when execution of the program is resumed, implementation is more complicated. Execution of the saved instruction could be emulated, but this is difficult to do, ensuring all side effects such as condition code setting and exception triggering are performed correctly, as well as correctly simulating all addressing modes, such as PC relative. It is much easier simply to execute the break pointed instruction in place, but to plant another breakpoint on a subsequent instruction in the same basic block, usually the immediate successor to the original breakpoint, so that the breakpoint handler can regain control in order to replant the original breakpoint and remove the secondary one. This obviously has some challenges if the successor of the break pointed instruction cannot be statically predicted, for instance if the break pointed instruction is a conditional jump, but a common solution is simply to ban planting breakpoints on such instructions. Identify the critical races that exist with this scheme if the program is executed by multiple threads, possibly multiple cores or multiple processors. Use pseudo-code to illustrate how you would resolve these issues.


Related Discussions:- Pseudo-code to illustrate the breakpoint in a program

Assembly language, I need help with having a user input a year, and my prog...

I need help with having a user input a year, and my program to spit out what day of the week Christmas is on.... any helping hands on this?

Prolog predicate for list that contains duplicate elements, Write a Prolog ...

Write a Prolog predicate  has_duplicates(L)  that is true if list  L  contains duplicated elements (that is at least 2 copies of an element). For instance: ?- has_duplicates([a,

Program for hold details of all the cabins for travellers, Scenario A ca...

Scenario A campsite provides cabins for travellers to stay in overnight. A 'cabin' is a small wooden hut, containing bunk beds, table and chairs, a heater, and a small cookin

Program for keep track of the titles of ebooks, This assignment will just f...

This assignment will just focus on NookyKindle eBook orders.  That is, we'll be keeping track of the titles of eBooks and the number of orders for that particular eBook during a pa

Determine the effect of class isze on test scores, Of the 6,325 kindergarte...

Of the 6,325 kindergarten students who participated in the study, almost half or 3,052 were eligible for a free lunch program. The categorical variable sesk (1 == free lunch, 2 = n

Visual Basic 2010 Karate Payments MDI Application, The following are requir...

The following are required for this lesson: Complete the Project "Adding New Payments," which is the Karate Payments that includes the Adding New Payments, Deleting Payments,

Non empty string - minimal unique substring, A non-empty string is called a...

A non-empty string is called a minimal unique substring of s if and only if it satisfies: (i) α occurs exactly once in s (uniqueness), (ii) all proper prefixes of occur at le

Implement a two-dimensional table in prolog, Implement a two-dimensional ta...

Implement a two-dimensional table in Prolog. Your program will contain: An insert_entry predicate that takes a table, row, column and an entry and inserts the entry at the g

ATM, The ATM will simulate a real world automated teller machine that suppo...

The ATM will simulate a real world automated teller machine that supports safe access to accounts from multiple concurrent clients.

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd