L28 | Intermediate Code Generator | Introduction | Synthesis Phase | Analysis Phase | Low High level скачать в хорошем качестве

L28 | Intermediate Code Generator | Introduction | Synthesis Phase | Analysis Phase | Low High level

Intermediate code generator receives input from its predecessor phase, semantic analyzer, in the form of an annotated syntax tree. That syntax tree then can be converted into a linear representation, e.g., postfix notation. Intermediate code tends to be machine independent code. Front end of compiler: the analysis phase of the compiler reads the source program, divides it into core parts and then checks for lexical, grammar and syntax errors. The analysis phase generates an intermediate representation of the source program and symbol table, which should be fed to the Synthesis phase as input. Back end: the synthesis phase generates the target program with the help of intermediate source code representation and symbol table. Intermediate Representation Intermediate codes can be represented in a variety of ways and they have their own benefits. High Level IR - High-level intermediate code representation is very close to the source language itself. They can be easily generated from the source code and we can easily apply code modifications to enhance performance. But for target machine optimization, it is less preferred. Low Level IR - This one is close to the target machine, which makes it suitable for register and memory allocation, instruction set selection, etc. It is good for machine-dependent optimizations.