static void* GetRandomAddr() {
- // The address range used to randomize RWX allocations in OS::Allocate
- // Try not to map pages into the default range that windows loads DLLs
- // Use a multiple of 64k to prevent committing unused memory.
- // Note: This does not guarantee RWX regions will be within the
- // range kAllocationRandomAddressMin to kAllocationRandomAddressMax
+ Isolate* isolate = Isolate::UncheckedCurrent();
+ // Note that the current isolate isn't set up in a call path via
+ // CpuFeatures::Probe. We don't care about randomization in this case because
+ // the code page is immediately freed.
+ if (isolate != NULL) {
+ // The address range used to randomize RWX allocations in OS::Allocate
+ // Try not to map pages into the default range that windows loads DLLs
+ // Use a multiple of 64k to prevent committing unused memory.
+ // Note: This does not guarantee RWX regions will be within the
+ // range kAllocationRandomAddressMin to kAllocationRandomAddressMax
#ifdef V8_HOST_ARCH_64_BIT
- static const intptr_t kAllocationRandomAddressMin = 0x0000000080000000;
- static const intptr_t kAllocationRandomAddressMax = 0x000003FFFFFF0000;
+ static const intptr_t kAllocationRandomAddressMin = 0x0000000080000000;
+ static const intptr_t kAllocationRandomAddressMax = 0x000003FFFFFF0000;
#else
- static const intptr_t kAllocationRandomAddressMin = 0x04000000;
- static const intptr_t kAllocationRandomAddressMax = 0x3FFF0000;
+ static const intptr_t kAllocationRandomAddressMin = 0x04000000;
+ static const intptr_t kAllocationRandomAddressMax = 0x3FFF0000;
#endif
- uintptr_t address = (V8::RandomPrivate(Isolate::Current()) << kPageSizeBits)
- | kAllocationRandomAddressMin;
- address &= kAllocationRandomAddressMax;
- return reinterpret_cast<void *>(address);
+ uintptr_t address = (V8::RandomPrivate(isolate) << kPageSizeBits)
+ | kAllocationRandomAddressMin;
+ address &= kAllocationRandomAddressMax;
+ return reinterpret_cast<void *>(address);
+ }
+ return NULL;
}