Compilation And Presentation Process: The Process Of The Interpretation Process

1.4 Compilation process

The process of Compilation and Interpretation is given in Figures 1.3 and 1.4 respectively.

Figure 1.3: Compilation Process

Figure 1.4 Interpretive process

As discussed, the compiler converts source program into relocatable object program, which then uses the data and executes in main memory on the other hand, the interpreter uses the source program and data and produces the execution without any intermediate object program.
1.4.1 Compiler
The compiler consists of two parts: Analysis and Synthesis.
- The analysis part breaks up the source program into constituent pieces and imposes a grammatical structure on them. It then uses this structure to create an intermediate representation of the source program.
- The synthesis of its corresponding program: constructs the desired target program from the intermediate

In this phase, the registers or memory locations are selected for each of the variables used by the program. The inputs to this phase which are the intermediate instructions are translated into sequences of machine instructions to complete an operation. One of the important consideration of code generation is the assignment of registers to hold variables as we have limited number of registers. This phase also need to decide on the choice of instructions involving registers, memory or a mix of the two.
Symbol Table: The symbol table is implemented as a data structure containing a record for each variable name, with fields for the attributes of the name. The symbol table is designed to help the compiler to identify and fetch the record for each name quickly. The symbol table has attributes that may provide information about the storage allocated for a name, its type, its scope. It also provides details on the function or procedure names, such things as the number and types of its arguments, the method of passing each argument and the return