SYNTAX ANALYSIS
ROLE OF THE PARSER
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Stack-based machine
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Accumulator based machine
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Two operand addresses
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None of the other options
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Detailed explanation-1: -Architecture. Like many other p-code machines, the UCSD p-Machine is a stack machine, which means that most instructions take their operands from a stack, and place results back on the stack. Thus, the add instruction replaces the two topmost elements of the stack with their sum.
Detailed explanation-2: -In stack machine code (sometimes called p-code), instructions will frequently have only an opcode commanding an operation, with no additional fields identifying a constant, register or memory cell, known as a zero address format. This greatly simplifies instruction decoding.
Detailed explanation-3: -A P-code machine is a type of computer that executes P-code or the assembly language of a CPU. IT professionals may refer to P-code as portable code or pseudocode.
Detailed explanation-4: -The big advantage is that you can write p-code “assembly” programs (or compile higher languages into p-code) and run them on many different machines. The language was optimized so as to be easy to emulate and to run smoothly on any machine.