How Does Go\'s Static Analysis Resolve Identifier Types?

Static Identifier Resolution in Go

Static analysis tools help identify potential issues and bugs in Go code by examining the code structure without executing it. Determining the type of identifiers is crucial for accurate static analysis.

In Go, the type information is separated from the AST (Abstract Syntax Tree) representation. To resolve the type of an identifier, we need to employ the "type checker" package, specifically golang.org/x/tools/go/types.

The loader package (golang.org/x/tools/go/loader) simplifies the process of dealing with import dependencies and provides a comprehensive types.Info structure for the analyzed AST. This structure contains the relationship between AST nodes and their types.

For identifier resolution, the Uses mapping in the types.Info structure will contain entries for referring identifiers (ast.Ident) and the corresponding named entities (types.Object). For other expressions, such as function calls or type assertions, the Types mapping will directly provide the type information.

In the example provided, we can use the loader package to parse the AST and retrieve the types.Info structure. The Uses mapping will contain an entry for the textToContain identifier, providing access to its type as a local variable (*types.Var). This allows us to determine that the type of text is a string.

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