• 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
test-platform-linux.cc 2.25 KB