diff options
Diffstat (limited to 'src/v8.cc')
| -rw-r--r-- | src/v8.cc | 38 |
1 files changed, 29 insertions, 9 deletions
@@ -44,6 +44,7 @@ bool V8::has_been_setup_ = false; bool V8::has_been_disposed_ = false; bool V8::has_fatal_error_ = false; + bool V8::Initialize(Deserializer* des) { bool create_heap_objects = des == NULL; if (has_been_disposed_ || has_fatal_error_) return false; @@ -176,22 +177,41 @@ static uint32_t random_seed() { } -uint32_t V8::Random() { - // Random number generator using George Marsaglia's MWC algorithm. - static uint32_t hi = 0; - static uint32_t lo = 0; +typedef struct { + uint32_t hi; + uint32_t lo; +} random_state; + +// Random number generator using George Marsaglia's MWC algorithm. +static uint32_t random_base(random_state *state) { // Initialize seed using the system random(). If one of the seeds // should ever become zero again, or if random() returns zero, we // avoid getting stuck with zero bits in hi or lo by re-initializing // them on demand. - if (hi == 0) hi = random_seed(); - if (lo == 0) lo = random_seed(); + if (state->hi == 0) state->hi = random_seed(); + if (state->lo == 0) state->lo = random_seed(); // Mix the bits. - hi = 36969 * (hi & 0xFFFF) + (hi >> 16); - lo = 18273 * (lo & 0xFFFF) + (lo >> 16); - return (hi << 16) + (lo & 0xFFFF); + state->hi = 36969 * (state->hi & 0xFFFF) + (state->hi >> 16); + state->lo = 18273 * (state->lo & 0xFFFF) + (state->lo >> 16); + return (state->hi << 16) + (state->lo & 0xFFFF); +} + + +// Used by JavaScript APIs +uint32_t V8::Random() { + static random_state state = {0, 0}; + return random_base(&state); +} + + +// Used internally by the JIT and memory allocator for security +// purposes. So, we keep a different state to prevent informations +// leaks that could be used in an exploit. +uint32_t V8::RandomPrivate() { + static random_state state = {0, 0}; + return random_base(&state); } |