// 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/frames.h" #include "src/interpreter/bytecode-register.h" #include "src/interpreter/bytecodes.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 BASE_EMBEDDED { public: explicit HandlerTableBuilder(Zone* zone); // Builds the actual handler table by copying the current values into a heap // object. Any further mutations to the builder won't be reflected. Handle<HandlerTable> ToHandlerTable(Isolate* 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_; DISALLOW_COPY_AND_ASSIGN(HandlerTableBuilder); }; } // namespace interpreter } // namespace internal } // namespace v8 #endif // V8_INTERPRETER_HANDLER_TABLE_BUILDER_H_