C2Rust Refactoring Tool

This is a refactoring tool for Rust programs, aimed at removing unsafety from automatically-generated Rust code.


c2rust refactor command line usage is as follows:

c2rust refactor [flags] <command> [command args] -- <input file> [rustc flags]

Flags for c2rust refactor are described by c2rust refactor --help.

See the command documentation for a list of commands, including complete usage and descriptions. Multiple commands can be separated by an argument consisting of a single semicolon, as in c2rust refactor cmd1 arg1 \; cmd2 arg2. (Note the semicolon needs to be escaped to prevent it from being interpreted by the shell.)

c2rust refactor requires rustc command line arguments for the program to be refactored, so that it can use rustc to load and typecheck the source code. For projects built with cargo, pass the --cargo flag to c2rust refactor and it will obtain the right arguments from cargo automatically. Otherwise, you must provide the rustc arguments on the c2rust refactor command line, after a -- separator.


Some commands require the user to "mark" some AST nodes for it to operate on. For example, the rename_struct command requires that the user mark the declaration of the struct that should be renamed.

Each mark associates a "label" with a specific AST node (identified by its NodeId). Labels are used to distinguish different types of marks, and a single node can have any number of marks with distinct labels. For example, when running the func_to_method command, which turns functions into methods in an inherent impl, the user must mark the functions to move with the target label and must mark the destination impl with the dest label. Nodes marked with other labels will be ignored. The set of labels recognized by a command is described in the command's documentation; by default, most commands that use marks operate on target.

The most flexible way of marking nodes is by using the select command. See the command documentation and src/select/mod.rs for details. Note that marks are not preserved across c2rust refactor invocations, so you usually want to run select followed by the command of interest using the ; separator mentioned above.