WasmException.h (1642B)
1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- 2 * vim: set ts=8 sts=2 et sw=2 tw=80: 3 * 4 * Copyright 2021 Mozilla Foundation 5 * 6 * Licensed under the Apache License, Version 2.0 (the "License"); 7 * you may not use this file except in compliance with the License. 8 * You may obtain a copy of the License at 9 * 10 * http://www.apache.org/licenses/LICENSE-2.0 11 * 12 * Unless required by applicable law or agreed to in writing, software 13 * distributed under the License is distributed on an "AS IS" BASIS, 14 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 15 * See the License for the specific language governing permissions and 16 * limitations under the License. 17 */ 18 19 #ifndef wasm_exception_h 20 #define wasm_exception_h 21 22 namespace js { 23 namespace wasm { 24 25 static const uint32_t CatchAllIndex = UINT32_MAX; 26 static_assert(CatchAllIndex > MaxTags); 27 28 struct TryTableCatch { 29 TryTableCatch() 30 : tagIndex(CatchAllIndex), labelRelativeDepth(0), captureExnRef(false) {} 31 32 // The tag index for this catch, or CatchAllIndex for a catch_all. 33 uint32_t tagIndex; 34 // The relative depth of where to branch to when catching an exception. 35 uint32_t labelRelativeDepth; 36 // Whether the exnref that is caught should be captured and passed to the 37 // branch target. 38 bool captureExnRef; 39 // The params that the target branch at `labelRelativeDepth` expects. This 40 // includes any exnref that should or should not be captured. 41 ValTypeVector labelType; 42 }; 43 using TryTableCatchVector = Vector<TryTableCatch, 1, SystemAllocPolicy>; 44 45 } // namespace wasm 46 } // namespace js 47 48 #endif // wasm_exception_h