[interpreter] add source positions for call and call-new.

src/interpreter/source-position-table.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/source-position-table.h"
+
+#include "src/assembler.h"
+#include "src/objects-inl.h"
+#include "src/objects.h"
+
+namespace v8 {
+namespace internal {
+namespace interpreter {
+
+class IsStatementField : public BitField<bool, 0, 1> {};
+class SourcePositionField : public BitField<int, 1, 30> {};
+
+void SourcePositionTableBuilder::AddStatementPosition(int bytecode_offset,
+                                                      int source_position) {
+  AssertMonotonic(bytecode_offset);
+  uint32_t encoded = IsStatementField::encode(true) |
+                     SourcePositionField::encode(source_position);
+  entries_.push_back({bytecode_offset, encoded});
+}
+
+void SourcePositionTableBuilder::AddExpressionPosition(int bytecode_offset,
+                                                       int source_position) {
+  AssertMonotonic(bytecode_offset);
+  uint32_t encoded = IsStatementField::encode(false) |
+                     SourcePositionField::encode(source_position);
+  entries_.push_back({bytecode_offset, encoded});
+}
+
+Handle<FixedArray> SourcePositionTableBuilder::ToFixedArray() {
+  int length = static_cast<int>(entries_.size());
+  Handle<FixedArray> table =
+      isolate_->factory()->NewFixedArray(length * 2, TENURED);
+  for (int i = 0; i < length; i++) {
+    table->set(i * 2, Smi::FromInt(entries_[i].bytecode_offset));
+    table->set(i * 2 + 1, Smi::FromInt(entries_[i].source_position_and_type));
+  }
+  return table;
+}
+
+SourcePositionTableIterator::SourcePositionTableIterator(
+    BytecodeArray* bytecode_array)
+    : table_(bytecode_array->source_position_table()),
+      index_(0),
+      length_(table_->length()) {
+  DCHECK(table_->length() % 2 == 0);
+  Advance();
+}
+
+void SourcePositionTableIterator::Advance() {
+  if (index_ < length_) {
+    int new_bytecode_offset = Smi::cast(table_->get(index_))->value();
+    // Bytecode offsets are in ascending order.
+    DCHECK(bytecode_offset_ < new_bytecode_offset || index_ == 0);
+    bytecode_offset_ = new_bytecode_offset;
+    uint32_t source_position_and_type =
+        static_cast<uint32_t>(Smi::cast(table_->get(index_ + 1))->value());
+    is_statement_ = IsStatementField::decode(source_position_and_type);
+    source_position_ = SourcePositionField::decode(source_position_and_type);
+  }
+  index_ += 2;
+}
+
+int SourcePositionTableIterator::PositionFromBytecodeOffset(
+    BytecodeArray* bytecode_array, int bytecode_offset) {
+  int last_position = 0;
+  for (SourcePositionTableIterator iterator(bytecode_array);
+       !iterator.done() && iterator.bytecode_offset() <= bytecode_offset;
+       iterator.Advance()) {
+    last_position = iterator.source_position();
+  }
+  return last_position;
+}
+
+}  // namespace interpreter
+}  // namespace internal
+}  // namespace v8