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Questions and Answers
What is the primary purpose of a code generator in a compiler?
What is a 'pass' in the context of a compiler?
How many passes are typically used in a multi-pass compiler?
What is the purpose of the second pass in a multi-pass compiler?
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What is the key difference between a multi-pass compiler and a one-pass compiler?
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What is the purpose of the semantic analysis phase in a multi-pass compiler?
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What is the main purpose of a compiler?
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What are the two main parts of the execution process of a program written in a high-level language?
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What is the role of the assembler in the execution process of a program written in a high-level language?
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What is the output of the syntax analysis phase of a compiler?
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What is the role of the lexical analyzer phase in a compiler?
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What is the correct sequence of the main phases in a compiler?
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What is the primary function of a compiler?
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What is the purpose of using a compiler in a machine's language processing system?
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What is the role of the preprocessor in the language processing system?
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What is the relationship between the preprocessor and the compiler in a machine's language processing system?
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What is the main challenge in writing programs directly in the machine's binary language?
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Study Notes
Compiler Overview
- A compiler is a translator that converts high-level language into machine language.
- It shows errors to the programmer and changes the code written in one language without changing the meaning of the program.
Compiler Passes
- A pass is a complete traversal of the source program.
- Compiler has two passes to traverse the source program.
- Multi-pass compiler processes the source code of a program several times.
- One-pass compiler traverses the program only once.
Multi-pass Compiler
- In the first pass, the compiler reads the source program, scans it, extracts the tokens, and stores the result in an output file.
- In the second pass, the compiler reads the output file produced by the first pass, builds the syntactic tree, and performs syntactical analysis.
- In the third pass, the compiler checks that the tree follows the rules of the language or not.
One-pass Compiler
- The one-pass compiler translates each part into its final machine code.
- When the line source is processed, it is scanned and the token is extracted.
- Then the syntax of each line is analyzed, and the tree structure is built.
- After the semantic part, the code is generated.
Compiler Phases
- The compilation process contains a sequence of various phases.
- Each phase takes the source program in one representation and produces output in another representation.
- Each phase takes input from its previous stage.
Lexical Analysis
- Lexical analysis is the first phase of the compilation process.
- It takes source code as input and reads the source program one character at a time.
- It converts the source code into meaningful lexemes and represents them in the form of tokens.
Syntax Analysis
- Syntax analysis is the second phase of the compilation process.
- It takes tokens as input and generates a parse tree as output.
Execution Process
- When a program is executed, it is compiled and translated into the object program (low-level language) in the first part.
- In the second part, the object program is translated into the target program through the assembler.
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Description
Test your knowledge on compiler passes and multi-pass compilers. Learn about how a compiler traverses the source program in multiple passes to translate intermediate code into machine code.
