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Compiler Writing

Compiler Writing. Source Language Issues Size of the source language (bigger = harder) Extent of change during compiler construction (more changes = harder) Performance Criteria Compiler Speed Code Quality Error Diagnostics Portability Maintainability. Performance Criteria. Portability

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Compiler Writing

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  1. Compiler Writing • Source Language Issues • Size of the source language (bigger = harder) • Extent of change during compiler construction (more changes = harder) • Performance Criteria • Compiler Speed • Code Quality • Error Diagnostics • Portability • Maintainability

  2. Performance Criteria • Portability • Retargetability • Rehostability • A Retargetable compiler is one that can be modified easily to generate code for a new target language • A rehostable compiler is one that can be moved easily to run on a new machine • A portable compiler may not be as efficient as a compiler designed for a specific machine, because we cannot make any specific assumption about the target machine

  3. How was the first compiler compiled? S T I • Bootstrapping: using the facilities offered by a language to compile itself is essence of bootstrapping • There are three languages involved in writing a compiler • Source Language (S) • Target Language (T) • Implementation Language (I) • T-Diagram

  4. How was the first compiler compiled? L N S M L N S M M • Cross Compiler: If S, T, and I are all different Languages, the compiler is a cross-Compiler • LSN + SMM = LMN

  5. Using BootStrapping to Port a Compiler L N L M L N L N L N L M M L N • LLN + LMM = LMN • LLN + LMN = LNN

  6. Using Bootstrapping to Optimize a Compiler S M S M* S M S M S M S M* M* S M • Using bootstrapping, an optimizing compiler can optimize itself (e.g., M is an optimizing Compiler) • SSM + LM*M* = SM*M • SSM + SM*M = SMM

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