Dart SDK SourceLoader

SourceLoader in the Dart SDK is a crucial component in the Dart compiler's frontend, responsible for loading, managing, and preprocessing Dart source code files as they enter the compilation pipeline. Its role is pivotal in ensuring that source files are correctly and efficiently processed for subsequent compilation stages.

1. Loading Source Code: The primary function of SourceLoader is to load Dart source code files into the compiler for processing. This involves reading Dart files (typically .dart files) from the file system or other sources.

2. Organizing and Managing Sources: SourceLoader is responsible for managing the sources that are part of a Dart program. This includes organizing these sources in a manner that aligns with the structure of the program, such as handling library imports, part directives, and file dependencies.

3. Preprocessing: Before the actual compilation steps like parsing and syntax analysis, SourceLoader might perform some preprocessing tasks. This could involve tasks like resolving URIs, handling conditional imports, and possibly caching sources for efficient access.

4. Integration with Compilation Pipeline: SourceLoader works closely with other components of the compiler, such as parsers and analyzers, to ensure that the source code is correctly processed. It acts as the entry point for source code into the compilation pipeline.

5. Support for Incremental Compilation: In some implementations, SourceLoader might also support incremental compilation, where it tracks changes in the source files and only reloads or reprocesses the changed parts, thereby speeding up the compilation process in development environments.

Subjects

• readAsEntryPoint
• firstRoot
• _read
• createLibraryBuilder
• Dart SDK SourceLoader

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