Working with SourceLocation and SourceManager
When working closely with source files, one of the most fundamental questions is how a compiler frontend would be able to locate a piece of string in the file. On one hand, printing format messages well (compilation error and warning messages, for example) is a crucial job, in which accurate line and column numbers must be displayed. On the other hand, the frontend might need to manage multiple files at a time and access their in-memory content in an efficient way. In Clang, these questions are primarily handled by two classes: SourceLocation and SourceManager. We're going to give you a brief introduction to them and show how to use them in practice in the rest of this section.
Introducing SourceLocation
The SourceLocation class is used for representing the location of a piece of code in its file. When it comes to its implementation, using line and column numbers is probably the most intuitive way to do this. However, things...
