Chapter 1. Preliminaries. Purpose of This Book. To examine carefully the underlying concepts of the various constructs and capabilities of programming languages. Chapter 1 Topics. Reasons for Studying Concepts of Programming Languages Programming Domains Language Evaluation Criteria
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count = count + 1
count += 1
A Reg1, memory_cell
AR Reg1, Regs
Reg1 <- contents(Reg1)+ contents(memory_cell)
Reg1 <- contents(Reg1)+ contents(Reg2)
ADDL operand_1, operand_2
Operand_2 <- contents(operand_1)+contents(opernad_2)
timeOut = true
int foo(unsigned int a, int b)
initialize the program counter
fetch the instruction pointed by the counter
increment the counter
decode the instruction
execute the instruction
P.S.: the ``decode the instruction’’ step in the algorithm means the instruction is examined to determine what action it specifies.
All of the evolutionary steps in Machinesoftware development methodologies led to new language constructs to support them.
The operating system and language implementation are layered over
Machine interface of a computer
If a is not a volatile variable, the optimization improve performance; otherwise, it introduces race condition problem.
address space of a process
#define max(A, B) ((A) > (B) ? (A): (B))
to determine the largest of two given expressions.