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    • bmeurer@chromium.org's avatar
      Introduce a RandonNumberGenerator class. Refactor the random/private_random... · eb381b94
      bmeurer@chromium.org authored
      Introduce a RandonNumberGenerator class. Refactor the random/private_random uses in Isolate/Context.
      
      The RandomNumberGenerator is a pseudorandom number generator
      with 48-bit state. It is properly seeded using either
      
      (1) the --random-seed if specified, or
      (2) the entropy_source function if configured, or
      (3) /dev/urandom if available, or
      (4) falls back to Time and TimeTicks based seeding.
      
      Each Isolate now contains a RandomNumberGenerator, which replaces
      the previous private_random_seed.
      
      Every native context still has its own random_seed. But this random
      seed is now properly initialized during bootstrapping,
      instead of on-demand initialization. This will allow us to cleanup
      and speedup the HRandom implementation quite a lot (this is delayed
      for a followup CL)!
      
      Also stop messing with the system rand()/random(), which should
      not be done from a library anyway! We probably re-seeded the
      libc rand()/random() after the application (i.e. Chrome) already
      seeded it (with better entropy than what we used).
      
      Another followup CL will replace the use of the per-isolate
      random number generator for the address randomization and
      thereby get rid of the Isolate::UncheckedCurrent() usage in
      the platform code.
      
      TEST=cctest/test-random-number-generator,cctest/test-random
      R=mstarzinger@chromium.org
      
      Review URL: https://codereview.chromium.org/23548024
      
      git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@16612 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
      eb381b94