Remove dependency from platform.h implementations on isolate

src/platform-win32.cc

Index: src/platform-win32.cc
diff --git a/src/platform-win32.cc b/src/platform-win32.cc
index b1e6478bc8c25bbed9698a9670247c7efc7a126c..9fe3e1411245ea929bd2ec0129985b3b46fb02b3 100644
--- a/src/platform-win32.cc
+++ b/src/platform-win32.cc
@@ -19,8 +19,9 @@
 
 #include "src/v8.h"
 
-#include "src/isolate-inl.h"
+#include "src/base/lazy-instance.h"
 #include "src/platform.h"
+#include "src/utils/random-number-generator.h"
 
 #ifdef _MSC_VER
 
@@ -708,31 +709,33 @@ size_t OS::AllocateAlignment() {
 }
 
 
+static base::LazyInstance<RandomNumberGenerator>::type
+    platform_random_number_generator = LAZY_INSTANCE_INITIALIZER;
+
+
+void OS::SetRandomSeed(int64_t seed) {
+  platform_random_number_generator.Pointer()->SetSeed(seed);
+}
+
+
 void* OS::GetRandomMmapAddr() {
-  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
+  // 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 =
-        (isolate->random_number_generator()->NextInt() << kPageSizeBits) |
-        kAllocationRandomAddressMin;
-    address &= kAllocationRandomAddressMax;
-    return reinterpret_cast<void *>(address);
-  }
-  return NULL;
+  uintptr_t address =
+      (platform_random_number_generator.Pointer()->NextInt() << kPageSizeBits) |
+      kAllocationRandomAddressMin;
+  address &= kAllocationRandomAddressMax;
+  return reinterpret_cast<void *>(address);
 }