Santanu Chattopadhyay received his BE degree in Computer Science and Technology from Calcutta University (B.E.
#Type checking in compiler design code
It can also help all other participants looking for an introduction to the domain of compiler designs and code translators. Being primarily targeted to a one-semester course for the undergraduate students, the course will follow the current GATE syllabus, enabling the students to prepare well for the same. This course on compiler design is to address all these issues, starting from the theoretical foundations to the architectural issues to automated tools. Advances in computer architecture, memory management and operating systems provide the compiler designer large number of options to try out for efficient code generation. Automata Theory provides the base of the course on which several automated tools can be designed to be used at various phases of a compiler. The actual process involved in this transformation is quite complex. There tools work as interface between the entities of two different domains – the human being and the machine. They are responsible for making the user’s computing requirements, specified as a piece of program, understandable to the underlying machine. The synthesis part of compiler consists of the following phases: Intermediate code generation, Code optimization and Target code generation.Compilers have become part and parcel of today’s computer systems. Synthesis phase construct the desired target program from the intermediate representation. Error handler generates a suitable error reporting message regarding the error encountered.Ģ. Whenever an error is encountered during the compilation of the source program, an error handler is invoked. Entries in the symbol table contain information about an identifier such as its type, its position in storage, and any other relevant information. The information is collected incrementally by the analysis phase of compiler and used by the synthesis phases to generate the target code. Symbol tables are data structures that are used by compilers to hold information about source- program constructs. It takes the optimized intermediate code as input and maps it to the target machine language. It removes the unnecessary lines of the code and arranges the sequence of statements in order to speed up the program execution without wasting resources.Ĭode generation is the final stage of the compilation process. It is used to improve the intermediate code so that the output of the program could run faster and takes less space. The intermediate code should be generated in such a way that it can easily translated into the target machine code.
#Type checking in compiler design generator
If the program syntactically and semantically correct then intermediate code generator generates a simple machine independent intermediate language. The synthesis part of compiler consists of the following phases: Intermediate code generation, Code optimization and Target code generation. Synthesis phase construct the desired target program from the intermediate representation. Analysis of source program includes: lexical analysis, syntax analysis and semantic analysis.Ģ. Analysis phase breaks up the source program into constituent pieces and creates an intermediate representation of the source program. The phases of a compiler are shown in below:ġ. A phase is a logically interrelated operation that takes source program in one representation and produces output in another representation. Semantic analyzer checks whether they form a sensible set of instructions in the programming language or not. Type-checking is an important part of semantic analyzer.Ī compiler operates in phases. In this phase, the semantic analyzer checks the source program for semantic errors and collects the type information for the code generation. In syntax analysis phase, the parser checks that the expression made by the token is syntactically correct or not, according to the rules that define the syntax of the source language. In this phase, the syntax analyzer takes the token produced by lexical analyzer as input and generates a parse tree as output. Token is a sequence of characters that can be treated as a single logical entity (such as identifier, operators, keywords, constants etc.). In this phase, lexical analyzer reads the source program and returns the tokens of the source program. Analysis of source program includes: lexical analysis, syntax analysis and semantic analysis. A compiler is a program that takes a program written in a source language and translates it into an equivalent program in a target language. As an important part of a compiler is error showing to the programmer.Īnalysis phase breaks up the source program into constituent pieces and creates an intermediate representation of the source program.