Extracting source code
Methods, systems, and apparatus, including computer programs encoded on computer storage media, for extracting source code. One of the methods includes receiving, by a newly created process, a request to execute code of an executable file in the newly created process, wherein the request specifies a parameter. The newly created process loads a process interception library. Library initialization code of the process interception library determines whether the parameter should be intercepted. In response to determining that the parameter should be intercepted, the parameter is provided to another process.
1. A method performed on a computer system comprising one or more computers, the method comprising:
receiving, by a custom create-process function that overrides a default create-process function of a parent process, a request to execute code of an executable file in a new process, wherein the request specifies a location of a source code file;
loading a custom process interception library into the new process, wherein loading the custom process interception library into the new process causes every subsequent new process to have its default create-process function preempted by the custom create-process function;
determining, by the custom create-process function, that the executable file is a compiler; and
in response to determining that the executable file is a compiler, providing the location of the source code file to a source code extractor.
2. The method of claim 1 , wherein loading the custom process interception library into the new process causes all child processes of the new process also to load the custom process interception library.
3. The method of claim 1 , wherein loading the custom process interception library causes library initialization code of the process interception library to override the default create-process function with the custom create-process function.
4. The method of claim 3 , wherein overriding the default create-process function in the new process with the custom create-process function comprises generating, by library initialization code of a process interception library, a modified export table entry for the default create-process function, wherein the modified export table entry for the default create-process function includes an address of the custom create-process function.
5. The method of claim 1 , further comprising:
invoking a new extractor process using the default create-process function,
wherein providing the location of the source code file to the source code extractor comprises providing the location of the source code file as a parameter to the new extractor process.
6. The method of claim 5 , further comprising invoking a new compiler process using the default create-process function.
7. The method of claim 6 , further comprising:
identifying an argument or an environment variable specified in the request to execute code of the executable file in the new process; and
modifying the argument or the environment variable specified in the request to execute code of the executable file in the new process,
wherein invoking the new compiler process using the default create-process function comprises invoking the new compiler process using the modified argument or environment variable.
8. A system comprising:
one or more computers and one or more storage devices storing instructions that are operable, when executed by the one or more computers, to cause the one or more computers to perform operations comprising:
receiving, by a custom create-process function that overrides a default create-process function of a parent process, a request to execute code of an executable file in a new process, wherein the request specifies a location of a source code file;
loading a custom process interception library into the new process, wherein loading the custom process interception library into the new process causes every subsequent new process to have its default create-process function preempted by the custom create-process function;
determining, by the custom create-process function, that the executable file is a compiler; and
in response to determining that the executable file is a compiler, providing the location of the source code file to a source code extractor.
9. The system of claim 8 , wherein loading the custom process interception library into the new process causes all child processes of the new process also to load the custom process interception library.
10. The system of claim 8 , wherein loading the custom process interception library causes library initialization code of the process interception library to override the default create-process function with the custom create-process function.
11. The system of claim 10 , wherein overriding the default create-process function in the new process with the custom create-process function comprises generating, by library initialization code of a process interception library, a modified export table entry for the default create-process function, wherein the modified export table entry for the default create-process function includes an address of the custom create-process function.
12. The system of claim 8 , wherein the operations further comprise:
invoking a new extractor process using the default create-process function,
wherein providing the location of the source code file to the source code extractor comprises providing the location of the source code file as a parameter to the new extractor process.
13. The system of claim 12 , wherein the operations further comprise invoking a new compiler process using the default create-process function.
14. The system of claim 13 , wherein the operations further comprise:
identifying an argument or an environment variable specified in the request to execute code of the executable file in the new process; and
modifying the argument or the environment variable specified in the request to execute code of the executable file in the new process,
wherein invoking the new compiler process using the default create-process function comprises invoking the new compiler process using the modified argument or environment variable.
15. One or more non-transitory computer storage media encoded with computer program instructions that when executed by one or more computers cause the one or more computers to perform operations comprising:
receiving, by a custom create-process function that overrides a default create-process function of a parent process, a request to execute code of an executable file in a new process, wherein the request specifies a location of a source code file;
loading a custom process interception library into the new process, wherein loading the custom process interception library into the new process causes every subsequent new process to have its default create-process function preempted by the custom create-process function;
determining, by the custom create-process function, that the executable file is a compiler; and
in response to determining that the executable file is a compiler, providing the location of the source code file to a source code extractor.
16. The one or more non-transitory computer storage media of claim 15 , wherein loading the custom process interception library into the new process causes all child processes of the new process also to load the custom process interception library.
17. The one or more non-transitory computer storage media of claim 15 , wherein loading the custom process interception library causes library initialization code of the process interception library to override the default create-process function with the custom create-process function.
18. The one or more non-transitory computer storage media of claim 17 , wherein overriding the default create-process function in the new process with the custom create-process function comprises generating, by library initialization code of a process interception library, a modified export table entry for the default create-process function, wherein the modified export table entry for the default create-process function includes an address of the custom create-process function.
19. The one or more non-transitory computer storage media of claim 17 , wherein the operations further comprise:
invoking a new extractor process using the default create-process function,
wherein providing the location of the source code file to the source code extractor comprises providing the location of the source code file as a parameter to the new extractor process.