Any position independent code is best written using which of

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Any position independent code is best written using which of the following addressing modes ?

AAbsolute

BDirect

CIndirect

DRelative.

Akilesh Kharvi ? Dec 8 '2016 at 21:52

Answer:Relative.

Explanation:

The relative addressing mode permits the writing of "position-independent code," programs which will be properly executed by the processor regardless of where they are located in memory.
The entire program (together with any necessary data) may be picked up from one region of memory and moved to another with no adverse effect. In order to be location-independent a program may not refer to any specific location by address. All references to memory must be through the use of relative addressing.

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All compilers are designed to be

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All compilers are designed to be

Arecursive

Bserially usable

Cself correcting

Dre-entrant.

Akilesh Kharvi ? Dec 8 '2016 at 21:48

Answer: re-entrant

Explanation:

Compilers and other programs were often written to be reentrant, so a single copy of the tool lived in memory, yet was shared by perhaps a hundred users. Each person had his or her own data area, yet everyone running the compiler quite literally executed identical code. As the operating system changed contexts from user to user it swapped data areas so one person's work didn't effect any other. Share the code, but not the data.
In the embedded world a routine must satisfy the following conditions to be reentrant:
->It uses all shared variables in an atomic way, unless each is allocated to a specific instance of the function.
->It does not call non-reentrant functions.
->It does not use the hardware in a non-atomic way.

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Generation of intermediate code based on an abstract machine

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Generation of intermediate code based on an abstract machine model is useful in compilers because

Ait makes the implementation of lexical analysis and syntax analysis easier

Bsyntax directed translations can be written for intermediate code generation

Cit enhances the portability of the front end of the compiler

Dit is not possible to directly generate code for real machines.

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Recursive descent parsing is an example of

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Recursive descent parsing is an example of

Atop down parsing

Bbottom up parsing

Cpredictive parsing

Dheuristic parsing.

Akilesh Kharvi ? Dec 8 '2016 at 21:45

Answer : top down parsing

Explanation:

One of the most straightforward forms of parsing is recursive descent parsing. This is a top-down process in which the parser attempts to verify that the syntax of the input stream is correct as it is read from left to right.

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In an absolute loading scheme, the assembler, in addition to

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In an absolute loading scheme, the assembler, in addition to its normal functions, should also perform

Aallocation

Breallocation

Clinking

Dloading

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