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
BytecodeLiveness(int register_count,Zone * zone)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
BytecodeLivenessMap(int bytecode_size,Zone * zone)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
OffsetHash(int offset)20 uint32_t OffsetHash(int offset) { return offset; }
21
InitializeLiveness(int offset,int register_count,Zone * zone)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
GetLiveness(int offset)32 BytecodeLiveness& BytecodeLivenessMap::GetLiveness(int offset) {
33 return liveness_map_.Lookup(offset, OffsetHash(offset))->value;
34 }
35
GetLiveness(int offset) const36 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