src/interpreter/handler-table-builder.cc

// Copyright 2016 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/interpreter/handler-table-builder.h"

#include "src/factory.h"
#include "src/isolate.h"
#include "src/objects-inl.h"

namespace v8 {
namespace internal {
namespace interpreter {

HandlerTableBuilder::HandlerTableBuilder(Isolate* isolate, Zone* zone)
    : isolate_(isolate), entries_(zone) {}

Handle<HandlerTable> HandlerTableBuilder::ToHandlerTable() {
  int handler_table_size = static_cast<int>(entries_.size());
  Handle<HandlerTable> table =
      Handle<HandlerTable>::cast(isolate_->factory()->NewFixedArray(
          HandlerTable::LengthForRange(handler_table_size), TENURED));
  for (int i = 0; i < handler_table_size; ++i) {
    Entry& entry = entries_[i];
    HandlerTable::CatchPrediction pred =
        entry.will_catch ? HandlerTable::CAUGHT : HandlerTable::UNCAUGHT;
    table->SetRangeStart(i, static_cast<int>(entry.offset_start));
    table->SetRangeEnd(i, static_cast<int>(entry.offset_end));
    table->SetRangeHandler(i, static_cast<int>(entry.offset_target), pred);
    table->SetRangeData(i, entry.context.index());
  }
  return table;
}


int HandlerTableBuilder::NewHandlerEntry() {
  int handler_id = static_cast<int>(entries_.size());
  Entry entry = {0, 0, 0, Register(), false};
  entries_.push_back(entry);
  return handler_id;
}


void HandlerTableBuilder::SetTryRegionStart(int handler_id, size_t offset) {
  DCHECK(Smi::IsValid(offset));  // Encoding of handler table requires this.
  entries_[handler_id].offset_start = offset;
}


void HandlerTableBuilder::SetTryRegionEnd(int handler_id, size_t offset) {
  DCHECK(Smi::IsValid(offset));  // Encoding of handler table requires this.
  entries_[handler_id].offset_end = offset;
}


void HandlerTableBuilder::SetHandlerTarget(int handler_id, size_t offset) {
  DCHECK(Smi::IsValid(offset));  // Encoding of handler table requires this.
  entries_[handler_id].offset_target = offset;
}


void HandlerTableBuilder::SetPrediction(int handler_id, bool will_catch) {
  entries_[handler_id].will_catch = will_catch;
}


void HandlerTableBuilder::SetContextRegister(int handler_id, Register reg) {
  entries_[handler_id].context = reg;
}

}  // namespace interpreter
}  // namespace internal
}  // namespace v8