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LLVM Techniques, Tips, and Best Practices Clang and Middle-End Libraries

You're reading from   LLVM Techniques, Tips, and Best Practices Clang and Middle-End Libraries Design powerful and reliable compilers using the latest libraries and tools from LLVM

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Product type Paperback
Published in Apr 2021
Publisher Packt
ISBN-13 9781838824952
Length 370 pages
Edition 1st Edition
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Author (1):
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Min-Yih Hsu Min-Yih Hsu
Author Profile Icon Min-Yih Hsu
Min-Yih Hsu
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Table of Contents (18) Chapters Close

Preface 1. Section 1: Build System and LLVM-Specific Tooling
2. Chapter 1: Saving Resources When Building LLVM FREE CHAPTER 3. Chapter 2: Exploring LLVM's Build System Features 4. Chapter 3: Testing with LLVM LIT 5. Chapter 4: TableGen Development 6. Section 2: Frontend Development
7. Chapter 5: Exploring Clang's Architecture 8. Chapter 6: Extending the Preprocessor 9. Chapter 7: Handling AST 10. Chapter 8: Working with Compiler Flags and Toolchains 11. Section 3: "Middle-End" Development
12. Chapter 9: Working with PassManager and AnalysisManager 13. Chapter 10: Processing LLVM IR 14. Chapter 11: Gearing Up with Support Utilities 15. Chapter 12: Learning LLVM IR Instrumentation 16. Assessments 17. Other Books You May Enjoy

Error-handling utilities in LLVM

Error handling has always been a widely discussed topic in software development. It can be as simple as returning an error code—such as in many of the Linux APIs (for example, the open function)—or using an advanced mechanism such as throwing an exception, which has been widely adopted by many modern programming languages such as Java and C++.

Although C++ has built-in support for exception handling, LLVM does not adopt it in its code base at all. The rationale behind this decision is that despite its convenience and expressive syntax, exception handling in C++ comes at a high cost in terms of performance. Simply speaking, exception handling makes the original code more complicated and hinders a compiler's ability to optimize it. Furthermore, during runtime, the program usually needs to spend more time recovering from an exception. Therefore, LLVM disables exception handling by default in its code base and falls back to other ways...

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