// Copyright 2016 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_INTERPRETER_HANDLER_TABLE_BUILDER_H_
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#define V8_INTERPRETER_HANDLER_TABLE_BUILDER_H_
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#include "src/frames.h"
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#include "src/interpreter/bytecode-register.h"
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#include "src/interpreter/bytecodes.h"
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#include "src/zone/zone-containers.h"
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namespace v8 {
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namespace internal {
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template <typename T>
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class Handle;
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class HandlerTable;
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class Isolate;
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namespace interpreter {
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// A helper class for constructing exception handler tables for the interpreter.
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class V8_EXPORT_PRIVATE HandlerTableBuilder final BASE_EMBEDDED {
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public:
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explicit HandlerTableBuilder(Zone* zone);
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// Builds the actual handler table by copying the current values into a heap
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// object. Any further mutations to the builder won't be reflected.
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Handle<ByteArray> ToHandlerTable(Isolate* isolate);
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// Creates a new handler table entry and returns a {hander_id} identifying the
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// entry, so that it can be referenced by below setter functions.
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int NewHandlerEntry();
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// Setter functions that modify certain values within the handler table entry
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// being referenced by the given {handler_id}. All values will be encoded by
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// the resulting {HandlerTable} class when copied into the heap.
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void SetTryRegionStart(int handler_id, size_t offset);
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void SetTryRegionEnd(int handler_id, size_t offset);
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void SetHandlerTarget(int handler_id, size_t offset);
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void SetPrediction(int handler_id, HandlerTable::CatchPrediction prediction);
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void SetContextRegister(int handler_id, Register reg);
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private:
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struct Entry {
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size_t offset_start; // Bytecode offset starting try-region.
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size_t offset_end; // Bytecode offset ending try-region.
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size_t offset_target; // Bytecode offset of handler target.
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Register context; // Register holding context for handler.
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// Optimistic prediction for handler.
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HandlerTable::CatchPrediction catch_prediction_;
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};
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ZoneVector<Entry> entries_;
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DISALLOW_COPY_AND_ASSIGN(HandlerTableBuilder);
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};
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} // namespace interpreter
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} // namespace internal
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} // namespace v8
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#endif // V8_INTERPRETER_HANDLER_TABLE_BUILDER_H_
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