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             : namespace v8 {
      10             : namespace internal {
      11             : namespace wasm {
      12             : 
      13           1 : void LocalDeclEncoder::Prepend(Zone* zone, const byte** start,
      14             :                                const byte** end) const {
      15           1 :   size_t size = (*end - *start);
      16           1 :   byte* buffer = reinterpret_cast<byte*>(zone->New(Size() + size));
      17           1 :   size_t pos = Emit(buffer);
      18           1 :   memcpy(buffer + pos, *start, size);
      19           1 :   pos += size;
      20           1 :   *start = buffer;
      21           1 :   *end = buffer + pos;
      22           1 : }
      23             : 
      24       73744 : size_t LocalDeclEncoder::Emit(byte* buffer) const {
      25             :   byte* pos = buffer;
      26      147488 :   LEBHelper::write_u32v(&pos, static_cast<uint32_t>(local_decls.size()));
      27      161207 :   for (auto& local_decl : local_decls) {
      28       13719 :     LEBHelper::write_u32v(&pos, local_decl.first);
      29       13719 :     *pos = WasmOpcodes::ValueTypeCodeFor(local_decl.second);
      30       13719 :     ++pos;
      31             :   }
      32             :   DCHECK_EQ(Size(), pos - buffer);
      33       73744 :   return static_cast<size_t>(pos - buffer);
      34             : }
      35             : 
      36       59213 : uint32_t LocalDeclEncoder::AddLocals(uint32_t count, ValueType type) {
      37             :   uint32_t result =
      38       59213 :       static_cast<uint32_t>(total + (sig ? sig->parameter_count() : 0));
      39       59213 :   total += count;
      40      118426 :   if (local_decls.size() > 0 && local_decls.back().second == type) {
      41       45582 :     count += local_decls.back().first;
      42             :     local_decls.pop_back();
      43             :   }
      44      118426 :   local_decls.push_back(std::pair<uint32_t, ValueType>(count, type));
      45       59213 :   return result;
      46             : }
      47             : 
      48      105168 : size_t LocalDeclEncoder::Size() const {
      49      105168 :   size_t size = LEBHelper::sizeof_u32v(local_decls.size());
      50      214539 :   for (auto p : local_decls) size += 1 + LEBHelper::sizeof_u32v(p.first);
      51      105168 :   return size;
      52             : }
      53             : 
      54             : }  // namespace wasm
      55             : }  // namespace internal
      56             : }  // namespace v8