1 // Copyright 2016 the V8 project authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "src/compiler/bytecode-liveness-map.h" 6 7 namespace v8 { 8 namespace internal { 9 namespace compiler { 10 11 BytecodeLiveness::BytecodeLiveness(int register_count, Zone* zone) 12 : in(new (zone) BytecodeLivenessState(register_count, zone)), 13 out(new (zone) BytecodeLivenessState(register_count, zone)) {} 14 15 BytecodeLivenessMap::BytecodeLivenessMap(int bytecode_size, Zone* zone) 16 : liveness_map_(base::bits::RoundUpToPowerOfTwo32(bytecode_size / 4 + 1), 17 base::KeyEqualityMatcher<int>(), 18 ZoneAllocationPolicy(zone)) {} 19 20 uint32_t OffsetHash(int offset) { return offset; } 21 22 BytecodeLiveness& BytecodeLivenessMap::InitializeLiveness(int offset, 23 int register_count, 24 Zone* zone) { 25 return liveness_map_ 26 .LookupOrInsert(offset, OffsetHash(offset), 27 [&]() { return BytecodeLiveness(register_count, zone); }, 28 ZoneAllocationPolicy(zone)) 29 ->value; 30 } 31 32 BytecodeLiveness& BytecodeLivenessMap::GetLiveness(int offset) { 33 return liveness_map_.Lookup(offset, OffsetHash(offset))->value; 34 } 35 36 const BytecodeLiveness& BytecodeLivenessMap::GetLiveness(int offset) const { 37 return liveness_map_.Lookup(offset, OffsetHash(offset))->value; 38 } 39 40 } // namespace compiler 41 } // namespace internal 42 } // namespace v8 43
