diff options
Diffstat (limited to 'deps/v8/src/platform-posix.cc')
| -rw-r--r-- | deps/v8/src/platform-posix.cc | 26 |
1 files changed, 4 insertions, 22 deletions
diff --git a/deps/v8/src/platform-posix.cc b/deps/v8/src/platform-posix.cc index e652a083c..3bc83733c 100644 --- a/deps/v8/src/platform-posix.cc +++ b/deps/v8/src/platform-posix.cc @@ -109,20 +109,11 @@ void* OS::GetRandomMmapAddr() { raw_addr &= V8_UINT64_C(0x3ffffffff000); #else uint32_t raw_addr = V8::RandomPrivate(isolate); - - // For our 32-bit mmap() hint, we pick a random address in the bottom - // half of the top half of the address space (that is, the third quarter). - // Because we do not MAP_FIXED, this will be treated only as a hint -- the - // system will not fail to mmap() because something else happens to already - // be mapped at our random address. We deliberately set the hint high enough - // to get well above the system's break (that is, the heap); systems will - // either try the hint and if that fails move higher (MacOS and other BSD - // derivatives) or try the hint and if that fails allocate as if there were - // no hint at all (Linux, Solaris, illumos and derivatives). The high hint - // prevents the break from getting hemmed in at low values, ceding half of - // the address space to the system heap. + // The range 0x20000000 - 0x60000000 is relatively unpopulated across a + // variety of ASLR modes (PAE kernel, NX compat mode, etc) and on macos + // 10.6 and 10.7. raw_addr &= 0x3ffff000; - raw_addr += 0x80000000; + raw_addr += 0x20000000; #endif return reinterpret_cast<void*>(raw_addr); } @@ -151,19 +142,11 @@ UNARY_MATH_FUNCTION(sin, CreateTranscendentalFunction(TranscendentalCache::SIN)) UNARY_MATH_FUNCTION(cos, CreateTranscendentalFunction(TranscendentalCache::COS)) UNARY_MATH_FUNCTION(tan, CreateTranscendentalFunction(TranscendentalCache::TAN)) UNARY_MATH_FUNCTION(log, CreateTranscendentalFunction(TranscendentalCache::LOG)) -UNARY_MATH_FUNCTION(exp, CreateExpFunction()) UNARY_MATH_FUNCTION(sqrt, CreateSqrtFunction()) #undef MATH_FUNCTION -void lazily_initialize_fast_exp() { - if (fast_exp_function == NULL) { - init_fast_exp_function(); - } -} - - double OS::nan_value() { // NAN from math.h is defined in C99 and not in POSIX. return NAN; @@ -349,7 +332,6 @@ void POSIXPostSetUp() { init_fast_cos_function(); init_fast_tan_function(); init_fast_log_function(); - // fast_exp is initialized lazily. init_fast_sqrt_function(); } |