![Toy Interpreter
It implements the meaning by invoking
appropriate routines.
ivar[5] :=7
Similarly rvar[13] :=1.2
For interpretation of a=b+c procedure add is
called with the symbol table entries of b and c.
add analyzes the type of b and c and decides that
procedure addrealint will have to be called to
realize the addition.](https://image.slidesharecdn.com/sp-191015150047/85/Toy-Interpreter-9-320.jpg)
![Toy Interpreter
Addrealint executes rvar[r_tos] :=rvar[13] +
ivar[5];
So while compiling the expression rvar[addr1] +
ivar[addr2]
Thus , the interpreter simply arranges to execute
this statement under the right conditions.](https://image.slidesharecdn.com/sp-191015150047/85/Toy-Interpreter-10-320.jpg)
Toy Interpreter
- 1. WELCOME Name: Dhrumil I. Panchal Enrollment No.: 170410107053 Subject: System Programming Branch: Computer Engineering Sem: 5th Sem Year: 2019-20
- 3. Contain Interpreter Toy Interpreter Interpreter Data Structure
- 4. Interpreter An interpreter is system software that translates a given High-Level Language (HLL) program into a low-level one, but it differs from compilers. Interpretation is a real-time activity where an interpreter takes the program, one statement at a time, and translates each line before executing it.
- 5. Toy Interpreter It is language processor that bridges execution gap of a program without generating a target program. The interpreter is itself a program in a programming language , which is compiled by a compiler of that language. The interpreter uses the symbol table and the data stores are as follows: The symbol table has entries for all the variables used in the program . Each entry holds the name , type and address of the variable.
- 6. Toy Interpreter The data store that holds values of all program variables and partial results during interpretation. It consists of two large arrays named rvar and ivar which are used to store values of types real and integer respectively. Last few locations in the array rvar and ivar are used to stacks for expression evaluation with the help of pointers r_tos and i_ios respectively. The stack grows upward in the array.
- 7. Toy Interpreter Each entry in the symbol table is a variable of type symmetry. The type field of the entry is a variable of enumerated type which takes either real_type or int_type as its values.
- 8. Toy Interpreter The interpreter program contains a set of routines for use in expression evaluations one routine for each kind of legal sub expression. real a, b integer c let c=7 let b=1.2 a = b + c
- 9. Toy Interpreter It implements the meaning by invoking appropriate routines. ivar[5] :=7 Similarly rvar[13] :=1.2 For interpretation of a=b+c procedure add is called with the symbol table entries of b and c. add analyzes the type of b and c and decides that procedure addrealint will have to be called to realize the addition.
- 10. Toy Interpreter Addrealint executes rvar[r_tos] :=rvar[13] + ivar[5]; So while compiling the expression rvar[addr1] + ivar[addr2] Thus , the interpreter simply arranges to execute this statement under the right conditions.
- 11. Interpreter Data Structure Symbol Type Address a real 8 b real 13 c int 5 rvar a b ivar c Symbol Table 8 13 r_tos 5 i_tos
- 12. References Inspiration from Prof. Shrina Patel and Prof. Rimi Gupta Notes of SP System Programming By D M Dhamdhere Images from Google Images Some My Own Knowledge
- 13. Thank You