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Issue 126113: Change the implementation of Math.random to use George... (Closed) Base URL: http://v8.googlecode.com/svn/branches/bleeding_edge/
Patch Set: '' Created 11 years, 6 months ago
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1 // Copyright 2009 the V8 project authors. All rights reserved. 1 // Copyright 2009 the V8 project authors. All rights reserved.
2 // Redistribution and use in source and binary forms, with or without 2 // Redistribution and use in source and binary forms, with or without
3 // modification, are permitted provided that the following conditions are 3 // modification, are permitted provided that the following conditions are
4 // met: 4 // met:
5 // 5 //
6 // * Redistributions of source code must retain the above copyright 6 // * Redistributions of source code must retain the above copyright
7 // notice, this list of conditions and the following disclaimer. 7 // notice, this list of conditions and the following disclaimer.
8 // * Redistributions in binary form must reproduce the above 8 // * Redistributions in binary form must reproduce the above
9 // copyright notice, this list of conditions and the following 9 // copyright notice, this list of conditions and the following
10 // disclaimer in the documentation and/or other materials provided 10 // disclaimer in the documentation and/or other materials provided
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2117 i::Handle<i::JSObject> self = Utils::OpenHandle(this); 2117 i::Handle<i::JSObject> self = Utils::OpenHandle(this);
2118 i::Handle<i::Object> hidden_props(i::GetHiddenProperties(self, true)); 2118 i::Handle<i::Object> hidden_props(i::GetHiddenProperties(self, true));
2119 i::Handle<i::Object> hash_symbol = i::Factory::identity_hash_symbol(); 2119 i::Handle<i::Object> hash_symbol = i::Factory::identity_hash_symbol();
2120 i::Handle<i::Object> hash = i::GetProperty(hidden_props, hash_symbol); 2120 i::Handle<i::Object> hash = i::GetProperty(hidden_props, hash_symbol);
2121 int hash_value; 2121 int hash_value;
2122 if (hash->IsSmi()) { 2122 if (hash->IsSmi()) {
2123 hash_value = i::Smi::cast(*hash)->value(); 2123 hash_value = i::Smi::cast(*hash)->value();
2124 } else { 2124 } else {
2125 int attempts = 0; 2125 int attempts = 0;
2126 do { 2126 do {
2127 hash_value = random() & i::Smi::kMaxValue; // Limit range to fit a smi. 2127 // Generate a random 32-bit hash value but limit range to fit
2128 // within a smi.
2129 hash_value = i::V8::Random() & i::Smi::kMaxValue;
2128 attempts++; 2130 attempts++;
2129 } while (hash_value == 0 && attempts < 30); 2131 } while (hash_value == 0 && attempts < 30);
2130 hash_value = hash_value != 0 ? hash_value : 1; // never return 0 2132 hash_value = hash_value != 0 ? hash_value : 1; // never return 0
2131 i::SetProperty(hidden_props, 2133 i::SetProperty(hidden_props,
2132 hash_symbol, 2134 hash_symbol,
2133 i::Handle<i::Object>(i::Smi::FromInt(hash_value)), 2135 i::Handle<i::Object>(i::Smi::FromInt(hash_value)),
2134 static_cast<PropertyAttributes>(None)); 2136 static_cast<PropertyAttributes>(None));
2135 } 2137 }
2136 return hash_value; 2138 return hash_value;
2137 } 2139 }
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3502 reinterpret_cast<HandleScopeImplementer*>(storage); 3504 reinterpret_cast<HandleScopeImplementer*>(storage);
3503 List<void**>* blocks_of_archived_thread = thread_local->Blocks(); 3505 List<void**>* blocks_of_archived_thread = thread_local->Blocks();
3504 v8::ImplementationUtilities::HandleScopeData* handle_data_of_archived_thread = 3506 v8::ImplementationUtilities::HandleScopeData* handle_data_of_archived_thread =
3505 &thread_local->handle_scope_data_; 3507 &thread_local->handle_scope_data_;
3506 Iterate(v, blocks_of_archived_thread, handle_data_of_archived_thread); 3508 Iterate(v, blocks_of_archived_thread, handle_data_of_archived_thread);
3507 3509
3508 return storage + ArchiveSpacePerThread(); 3510 return storage + ArchiveSpacePerThread();
3509 } 3511 }
3510 3512
3511 } } // namespace v8::internal 3513 } } // namespace v8::internal
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