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bytecode-offset-iterator.cc
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65 lines (56 loc) · 2.29 KB
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// Copyright 2021 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/baseline/bytecode-offset-iterator.h"
#include "src/objects/code-inl.h"
namespace v8 {
namespace internal {
namespace baseline {
BytecodeOffsetIterator::BytecodeOffsetIterator(Handle<ByteArray> mapping_table,
Handle<BytecodeArray> bytecodes)
: mapping_table_(mapping_table),
data_start_address_(mapping_table_->GetDataStartAddress()),
data_length_(mapping_table_->length()),
current_index_(0),
bytecode_iterator_(bytecodes),
local_heap_(LocalHeap::Current()
? LocalHeap::Current()
: Isolate::Current()->main_thread_local_heap()) {
local_heap_->AddGCEpilogueCallback(UpdatePointersCallback, this);
Initialize();
}
BytecodeOffsetIterator::BytecodeOffsetIterator(ByteArray mapping_table,
BytecodeArray bytecodes)
: data_start_address_(mapping_table.GetDataStartAddress()),
data_length_(mapping_table.length()),
current_index_(0),
bytecode_handle_storage_(bytecodes),
// In the non-handlified version, no GC is allowed. We use a "dummy"
// handle to pass the BytecodeArray to the BytecodeArrayIterator, which
// is fine since no objects will be moved.
bytecode_iterator_(Handle<BytecodeArray>(
reinterpret_cast<Address*>(&bytecode_handle_storage_))),
local_heap_(nullptr) {
no_gc_.emplace();
Initialize();
}
BytecodeOffsetIterator::~BytecodeOffsetIterator() {
if (local_heap_ != nullptr) {
local_heap_->RemoveGCEpilogueCallback(UpdatePointersCallback, this);
}
}
void BytecodeOffsetIterator::Initialize() {
// Initialize values for the prologue.
// The first recorded position is at the start of the first bytecode.
current_pc_start_offset_ = 0;
current_pc_end_offset_ = ReadPosition();
current_bytecode_offset_ = kFunctionEntryBytecodeOffset;
}
void BytecodeOffsetIterator::UpdatePointers() {
DisallowGarbageCollection no_gc;
DCHECK(!mapping_table_.is_null());
data_start_address_ = mapping_table_->GetDataStartAddress();
}
} // namespace baseline
} // namespace internal
} // namespace v8