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// 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.
#ifndef V8_INTERPRETER_HANDLER_TABLE_BUILDER_H_
#define V8_INTERPRETER_HANDLER_TABLE_BUILDER_H_
#include "src/codegen/handler-table.h"
#include "src/interpreter/bytecode-register.h"
#include "src/interpreter/bytecodes.h"
#include "src/objects/fixed-array.h"
#include "src/zone/zone-containers.h"
namespace v8 {
namespace internal {
template <typename T>
class Handle;
class HandlerTable;
class Isolate;
namespace interpreter {
// A helper class for constructing exception handler tables for the interpreter.
class V8_EXPORT_PRIVATE HandlerTableBuilder final {
public:
explicit HandlerTableBuilder(Zone* zone);
HandlerTableBuilder(const HandlerTableBuilder&) = delete;
HandlerTableBuilder& operator=(const HandlerTableBuilder&) = delete;
// Builds the actual handler table by copying the current values into a heap
// object. Any further mutations to the builder won't be reflected.
template <typename IsolateT>
Handle<ByteArray> ToHandlerTable(IsolateT* isolate);
// Creates a new handler table entry and returns a {hander_id} identifying the
// entry, so that it can be referenced by below setter functions.
int NewHandlerEntry();
// Setter functions that modify certain values within the handler table entry
// being referenced by the given {handler_id}. All values will be encoded by
// the resulting {HandlerTable} class when copied into the heap.
void SetTryRegionStart(int handler_id, size_t offset);
void SetTryRegionEnd(int handler_id, size_t offset);
void SetHandlerTarget(int handler_id, size_t offset);
void SetPrediction(int handler_id, HandlerTable::CatchPrediction prediction);
void SetContextRegister(int handler_id, Register reg);
private:
struct Entry {
size_t offset_start; // Bytecode offset starting try-region.
size_t offset_end; // Bytecode offset ending try-region.
size_t offset_target; // Bytecode offset of handler target.
Register context; // Register holding context for handler.
// Optimistic prediction for handler.
HandlerTable::CatchPrediction catch_prediction_;
};
ZoneVector<Entry> entries_;
};
} // namespace interpreter
} // namespace internal
} // namespace v8
#endif // V8_INTERPRETER_HANDLER_TABLE_BUILDER_H_
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