Private Code Test

This directory provides a mechanism for testing that native does not link in object files from unwanted directories. The test finds all linker inputs, and checks that none live inside a list of internal paths.

Original bug: https://bugs.chromium.org/p/chromium/issues/detail?id=1266989

Determining Internal Directories

This is done by parsing the .gclient_entries file for all paths coming from https://chrome-internal.googlesource.com. I chose this approach since it is simple.

The main alternative I found was to use gclient flatten. Example output:

  # src -> src-internal
  "src-internal": {
    "url": "https://chrome-internal.googlesource.com/chrome/src-internal.git@c649c6a155fe65c3730e2d663d7d2058d33bf1f9",
    "condition": 'checkout_src_internal',
  },

Paths could be found in this way by looking for checkout_src_internal within condition, and by looking for the comment line for recurse_deps that went through an internal repo.

Determining Linker Inputs

This is done by performing a custom link step with a linker that just records inputs. This seemed like the simplest approach.

Two alternatives:

Dump paths found in debug information.
Scan a linker map file for input paths.