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Unified Diff: src/interpreter/bytecode-array-reverse-iterator.cc

Issue 2518003002: [ignition] Add a reverse bytecode iterator (Closed)
Patch Set: Make class final Created 4 years, 1 month ago
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Index: src/interpreter/bytecode-array-reverse-iterator.cc
diff --git a/src/interpreter/bytecode-array-reverse-iterator.cc b/src/interpreter/bytecode-array-reverse-iterator.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d4be64eaa11afb4733b7b531c8cb551c60b71659
--- /dev/null
+++ b/src/interpreter/bytecode-array-reverse-iterator.cc
@@ -0,0 +1,46 @@
+// Copyright 2015 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/bytecode-array-reverse-iterator.h"
+#include "src/objects-inl.h"
+
+namespace v8 {
+namespace internal {
+namespace interpreter {
+
+BytecodeArrayReverseIterator::BytecodeArrayReverseIterator(
+ Handle<BytecodeArray> bytecode_array, Zone* zone)
+ : BytecodeArrayAccessor(bytecode_array, 0), offsets_(zone) {
+ // Run forwards through the bytecode array to determine the offset of each
+ // bytecode.
+ while (current_offset() < bytecode_array->length()) {
+ offsets_.push_back(current_offset());
+ SetOffset(current_offset() + current_bytecode_size());
+ }
+ Reset();
+}
+
+void BytecodeArrayReverseIterator::Advance() {
+ it_offsets_++;
+ UpdateOffsetFromIterator();
+}
+
+void BytecodeArrayReverseIterator::Reset() {
+ it_offsets_ = offsets_.rbegin();
+ UpdateOffsetFromIterator();
+}
+
+bool BytecodeArrayReverseIterator::done() const {
+ return it_offsets_ == offsets_.rend();
+}
+
+void BytecodeArrayReverseIterator::UpdateOffsetFromIterator() {
+ if (it_offsets_ != offsets_.rend()) {
+ SetOffset(*it_offsets_);
+ }
+}
+
+} // namespace interpreter
+} // namespace internal
+} // namespace v8
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