WasmProcess.h (2365B)
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 2017 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_process_h 20 #define wasm_process_h 21 22 #include "mozilla/Atomics.h" 23 24 #include "wasm/WasmMemory.h" 25 26 namespace js { 27 namespace wasm { 28 29 class Code; 30 class CodeRange; 31 class CodeBlock; 32 class TagType; 33 34 extern const TagType* sWrappedJSValueTagType; 35 static constexpr uint32_t WrappedJSValueTagType_ValueOffset = 0; 36 37 // These methods return the wasm::CodeBlock (resp. wasm::Code) containing 38 // the given pc, if any exist in the process. These methods do not take a lock, 39 // and thus are safe to use in a profiling context. 40 41 const CodeBlock* LookupCodeBlock(const void* pc, 42 const CodeRange** codeRange = nullptr); 43 44 const Code* LookupCode(const void* pc, const CodeRange** codeRange = nullptr); 45 46 // Return whether the given PC is in any type of wasm code (module or builtin). 47 48 bool InCompiledCode(void* pc); 49 50 // A bool member that can be used as a very fast lookup to know if there is any 51 // code segment at all. 52 53 extern mozilla::Atomic<bool> CodeExists; 54 55 // These methods allow to (un)register CodeBlocks so they can be looked up 56 // via pc in the methods described above. 57 58 bool RegisterCodeBlock(const CodeBlock* cs); 59 60 void UnregisterCodeBlock(const CodeBlock* cs); 61 62 // Whether this process is configured to use huge memory or not. Note that this 63 // is not precise enough to tell whether a particular memory uses huge memory, 64 // there are additional conditions for that. 65 66 bool IsHugeMemoryEnabled(AddressType t, PageSize sz); 67 68 // Called once before/after the last VM execution which could execute or compile 69 // wasm. 70 71 bool Init(); 72 73 void ShutDown(); 74 75 } // namespace wasm 76 } // namespace js 77 78 #endif // wasm_process_h