Line data Source code
1 : // Copyright 2017 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/wasm/local-decl-encoder.h"
6 :
7 : #include "src/wasm/leb-helper.h"
8 :
9 : using namespace v8::internal;
10 : using namespace v8::internal::wasm;
11 :
12 1 : void LocalDeclEncoder::Prepend(Zone* zone, const byte** start,
13 : const byte** end) const {
14 1 : size_t size = (*end - *start);
15 1 : byte* buffer = reinterpret_cast<byte*>(zone->New(Size() + size));
16 1 : size_t pos = Emit(buffer);
17 1 : memcpy(buffer + pos, *start, size);
18 1 : pos += size;
19 1 : *start = buffer;
20 1 : *end = buffer + pos;
21 1 : }
22 :
23 76951 : size_t LocalDeclEncoder::Emit(byte* buffer) const {
24 : byte* pos = buffer;
25 153902 : LEBHelper::write_u32v(&pos, static_cast<uint32_t>(local_decls.size()));
26 164911 : for (auto& local_decl : local_decls) {
27 11009 : LEBHelper::write_u32v(&pos, local_decl.first);
28 : *pos = WasmOpcodes::ValueTypeCodeFor(local_decl.second);
29 11009 : ++pos;
30 : }
31 : DCHECK_EQ(Size(), pos - buffer);
32 76951 : return static_cast<size_t>(pos - buffer);
33 : }
34 :
35 39873 : uint32_t LocalDeclEncoder::AddLocals(uint32_t count, ValueType type) {
36 : uint32_t result =
37 39873 : static_cast<uint32_t>(total + (sig ? sig->parameter_count() : 0));
38 39873 : total += count;
39 79746 : if (local_decls.size() > 0 && local_decls.back().second == type) {
40 28950 : count += local_decls.back().first;
41 : local_decls.pop_back();
42 : }
43 79746 : local_decls.push_back(std::pair<uint32_t, ValueType>(count, type));
44 39873 : return result;
45 : }
46 :
47 108785 : size_t LocalDeclEncoder::Size() const {
48 108785 : size_t size = LEBHelper::sizeof_u32v(local_decls.size());
49 196748 : for (auto p : local_decls) size += 1 + LEBHelper::sizeof_u32v(p.first);
50 108785 : return size;
51 : }
|