| /* |
| * Copyright 2016 WebAssembly Community Group participants |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #ifndef wasm_wasm_emscripten_h |
| #define wasm_wasm_emscripten_h |
| |
| #include "wasm.h" |
| #include "wasm-builder.h" |
| |
| namespace wasm { |
| |
| // Class which modifies a wasm module for use with emscripten. Generates |
| // runtime functions and emits metadata. |
| class EmscriptenGlueGenerator { |
| public: |
| EmscriptenGlueGenerator(Module& wasm, Address stackPointerOffset = Address(0)) |
| : wasm(wasm), |
| builder(wasm), |
| stackPointerOffset(stackPointerOffset), |
| useStackPointerGlobal(stackPointerOffset == 0) { } |
| |
| void generateRuntimeFunctions(); |
| Function* generateMemoryGrowthFunction(); |
| |
| // Create thunks for use with emscripten Runtime.dynCall. Creates one for each |
| // signature in the indirect function table. |
| void generateDynCallThunks(); |
| |
| // Create thunks to support emscripten's addFunction functionality. Creates (# |
| // of reserved function pointers) thunks for each indirectly called function |
| // signature. |
| void generateJSCallThunks(unsigned numReservedFunctionPointers); |
| |
| std::string generateEmscriptenMetadata( |
| Address staticBump, std::vector<Name> const& initializerFunctions, |
| unsigned numReservedFunctionPointers); |
| |
| // Replace placeholder emscripten_asm_const functions with *_signature versions. |
| void fixEmAsmConsts(); |
| |
| private: |
| Module& wasm; |
| Builder builder; |
| Address stackPointerOffset; |
| bool useStackPointerGlobal; |
| |
| Global* getStackPointerGlobal(); |
| Expression* generateLoadStackPointer(); |
| Expression* generateStoreStackPointer(Expression* value); |
| void generateStackSaveFunction(); |
| void generateStackAllocFunction(); |
| void generateStackRestoreFunction(); |
| }; |
| |
| std::string emscriptenGlue( |
| Module& wasm, |
| bool allowMemoryGrowth, |
| Address stackPointer, |
| Address staticBump, |
| std::vector<Name> const& initializerFunctions, |
| unsigned numReservedFunctionPointers); |
| |
| } // namespace wasm |
| |
| #endif // wasm_wasm_emscripten_h |