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Why do you think is better to bind data and instructions to memory at execution time than doing it at compile time?
Binding data and instructions to memory at execution time allows for greater flexibility and adaptability in program execution. It enables dynamic memory allocation, which can optimize resource usage based on actual runtime conditions, such as user input or varying data sizes. Additionally, this approach can enhance security by making it harder for malicious actors to predict memory layouts, thereby reducing vulnerabilities. In contrast, compile-time binding can lead to inefficient memory use and less responsiveness to changing program requirements.
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How are the address binding of instructions and data is carried to memory address?
Address binding of instructions and data to memory addresses can happen at three different stages: Compile time: If memory location known a priori, absolute code can be generated; must recompile code if starting location changes. Load time: Must generate relocateable code if memory location is not known at compile time. Execution time: Binding delayed until run time if the process can be moved during its execution from one memory segment to another. Need hardware support for address maps (e.g., base and limit registers).
What is compile-go loader?
compile and go loader is a type of loader function to have an assembler run in one part of the memory and places the assembled machine instructions,data as they are assembled,directly into their assigned memory location.
What does it mean to run a program?
In computer terminology, "running a program" means copying a sequence of instructions from storage into main memory and initiating the execution or interpretation of those instructions.
Why is not possible to enforce memory protection at compile time?
This cannot be done at compile time because the memory allocated to a process is subject to change.
Does main memory provide the CPU with a working storage area for program instructions and data?
main memory provides buffers.buffers are the places where program execution takes place.but the CPU is provided with registers(memory units) there CPU can accomodate instructions and the data on which theses instructions are to be operated.from the main memory CPU fetches the instructions one by one and the instruction is processed in the CPU and then sends back the result to the main memory......i think so.thank u
When you compile source code where the variables stored?
When you compile source code, the variables are stored in memory during program execution. The compiler translates the source code into machine code, which allocates memory for variables in different segments, such as the stack (for local variables) and the heap (for dynamically allocated memory). The specific location and management of these variables depend on the programming language, the compiler, and the architecture of the system. Additionally, constants and global variables may be stored in separate memory regions.
What is address binding in operating systems?
A program, to be executed, must be brought to main memory. The instructions that use addresses in a program, must be bound to proper address space in main memory. Address binding is a scheme that performs this job. It can be thought as a mapping from one address space to another. There are bindings available as follows: Compile time binding Load time binding Execution time binding
What is meant by flow of execution a program?
That means to load a computer program into a computer's memory, and have the computer carry out the instructions in the program.
What is dynamic mamory?
Dynamic memory refers to memory that is allocated and deallocated during program execution, as opposed to static memory which is allocated at compile time. In C and C++, dynamic memory allocation is done using functions like malloc() and free(), allowing for flexibility in managing memory resources at runtime. However, improper use of dynamic memory can lead to memory leaks or segmentation faults.
What is difference in static and dynamic storage allocation?
Static storage allocation is when a program dedicates an amount of memory for its use at the start of the program. Dynamic storage allocation is when a program only takes storage as it needs it.
Why is it not possible to enforse memory protection at compile time?
Memory protection cannot be enforced at compile time because it relies on runtime information about how memory is accessed and used by a program. The compiler does not have complete knowledge of the runtime environment, such as dynamic memory allocation, pointers, or the interactions between different modules. Additionally, certain behaviors, like buffer overflows or access violations, may only become apparent during execution. Thus, enforcing memory protection requires mechanisms that operate at runtime, such as operating system support and hardware features.
What are the functions of cu and alu?
The ALU (Arithmetic Logic Unit) performs arithmetic and logical operations on data such as addition, subtraction, AND, OR, and NOT operations. The CU (Control Unit) manages the execution of instructions, fetching them from memory, decoding them, and coordinating the ALU, memory, and input/output devices to carry out the instructions.
