Differences

Difference between assembler and compiler

Main difference
The difference between assembler and compiler is that the compiler takes the source code and translates it into assembly code, while the assembler takes the assembler code generated by the compiler and translates it into machine code.

Assembler vs. Compiler

Difference between assembler and compiler
Difference between assembler and compiler

Two terms that play the most important role in the execution of the program are compiler and assembler. The compiler’s job is to take the preprocessed source code and translate it into assembly code. Then an assembler’s job is to take the assembler code from the compiler and translate it into machine code. If we talk about the main difference, then the main difference between assembler and compiler is that the compiler takes the source code and translates it to the assembly code, while the assembler takes the assembly code generated by the compiler and translates it to the machine code. The compiler reads the program that is written in a source language. The compiler is a computer program that translates source code into assembly language, and this assembly language code is sent to the assembler. There are types of compilers such as the single pass compiler, the multi pass compiler, the load and run compiler, and the debug and tune compiler. The assembler takes the assembler code generated by the compiler and translates it into machine code. The assembler’s main job is to take the data as input and form the relocatable machine code. There is a compiler available that performs the assembly task and directly generates the machine code, but that does not mean that we cannot study the functions of the assembler. There is a big difference between assembly code and machine code. All of these different types of compilers perform different functions and are different depending on the job. The assembly code is the mnemonic version of the machine code, whereas the machine code uses the binary codes for the representation of operations of a memory address. Two passes are preformed in assembler which are the first pass that identifies the assembly code and stores that code in the symbol table and then the second pass that scans the code again and performs the operations on the code. There are two steps in which compilation is done, a step is the analysis part where the source code is broken into pieces and the intermediate rendering is done. In the synthesis part, the destination code forms the intermediate representation. There are phases of the compiler which are a lexical parser, syntax parser, semantic parser, intermediate code generation, code optimizer, code generator, symbol table, and error handler.

Comparative chart
Assembler Compiler
Assembler is a computer program that takes the assembly code generated by the compiler and translates it into machine code. The compiler is a computer program that takes source code and translates it into assembly code.
Entrance
Assembler input assembly language code Compiler input source code
Stages
The assembler phases are the first and second phases. The compiler stages are a lexical parser, syntax parser, semantic parser, generated intermediate code, code optimizer, code generator, symbol table, and error handler.
Departure
The assembler

Difference between assembler and compiler
Difference between assembler and compiler

output is binary code.

The compiler output is a mnemonic version of the code.

What is a compiler?

The compiler reads the program that is written in a source language. The compiler is a computer program that translates source code into assembly language, and this assembly language code is sent to the assembler. There are types of compilers such as the single pass compiler, the multi pass compiler, the load and run compiler, and the debug and tune compiler. All of these different types of compilers perform different functions and are different depending on the job. There are two steps where compilation is done, one step is the analysis part where the source code is broken down into pieces and the intermediate rendering is done. In the synthesis part, the destination code forms the intermediate representation. There are phases of the compiler which are a lexical parser, syntax parser,

The assembler and the compiler are not the same processes, but they do the same work, that is, they generate the object code of a source program and deliver it to the linker. The main process of the linker is to take the code from the object and generate the executable code for the program after this linker job is finished, and assign the code to the loader. There are some built-in libraries and header files in a high-level language. There are some library functions that are defined in built-in libraries. These functions are linked to a library function by the linker. The compiler is informed in the event that the library function for the particular function cannot be found. When there is a large program, it is divided into smaller programs known as modules. Object modules are generated when these modules are compiled or assembled. Linker has to combine the whole program. There are two types of linkers, one is the link editor that generates a relocated executable module and another is a dynamic linker that links the external modules until the load module is generated. The program to be executed is present in main memory. Loader, loads the executable file into the operating system. Loader allocates memory space to executable module in main memory. There are three types of loader which are: absolute loader, relocatable loader, and dynamic runtime loading. These three loaders have different loading approaches which are the absolute loading approach, the relocatable loading approach, and the dynamic runtime loading approach. The absolute loader loads the program’s executable file to the same location in main memory. In absolute loader, the programmer must know the assignment. The relocation loader compiles or assembles the actual main memory address. Dynamic runtime loader, the absolute memory program is generated when an instruction is executed.

What is Assembler?

The assembler takes the assembler code generated by the compiler and translates it into machine code. The assembler’s main job is to take the data as input and form the relocatable machine code. There is a compiler available that performs the assembler task and directly generates the machine code, but that does not mean that we cannot study the assembler functions. There is a big difference between assembly code and machine code. Assembly code is the mnemonic version of machine code, while machine code uses binary codes to represent memory address operations.

Key differences
  1. Assembler is a computer program that takes the assembly code generated by the compiler and translates it into machine code, while Compiler is a computer program that takes source code and translates it into assembly code.
  2. The assembler enters the assembly language code while the compiler enters the source code.
  3. The assembler phases are the first and a second phase . The compiler stages are a lexical parser, syntax parser, semantic parser, generated intermediate code, code optimizer, code generator, symbol table, and error handler.
  4. The output of the assembler is binary code, while the output of the compiler is a mnemonic version of the code.

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